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The Patterson–Gimlin film (also known as the Patterson film or the PGF) is a famous, short motion picture of an unidentified subject the film-makers said was a "Bigfoot." It is 23.85 feet long (preceded by 76.15 feet of "horseback" footage), has 954 frames, and runs for 59.5 seconds at 16 frames per second. (If the film was shot at 18 fps, as Grover Krantz believes, the event lasted 53 seconds.) The date was October 20, 1967, according to the film-makers, although some critics believe it was shot earlier.

It was filmed on Bluff Creek, a tributary of the Klamath River, about 25 logging-road miles northwest of Orleans, California, in Del Norte county. The filmsite is roughly 38 miles south of Oregon and 18 miles east of the Pacific Ocean. (For decades the exact location of the site was lost, primarily because of regrowth of foliage in the streambed after the flood of 1964. It was rediscovered in 2012.)

The film-makers were Roger Patterson (February 14, 1933 – January 15, 1972) and Robert "Bob" Gimlin (born October 18, 1931). Patterson died of cancer in 1972 and "maintained right to the end that the creature on the film was real." Patterson's friend, Gimlin, has always denied being involved in any part of a hoax with Patterson. Gimlin mostly avoided publicly discussing the subject from at least the early 1970s until about 2000 (save for three appearances), when he began giving interviews and appearing at Bigfoot conferences.

The film has been subjected to many attempts both to debunk and authenticate it. Some scientists who have studied the film have judged it to be a hoax with a man in an ape suit. Other scientists have done studies concluding the subject is likely nonhuman.

Background
Patterson said he became interested in Bigfoot after reading an article about the creature by Ivan T. Sanderson in True magazine in December 1959. Thereafter, Marian Place wrote:

"In 1962 he visited Bluff Creek and talked with a whole host of Bigfoot-believers. In 1964 he returned, and met a timber-cruiser named Pat Graves who drove him to Laird Meadows. There Patterson saw fresh tracks--for him an almost unbearably exciting, spine-chilling experience. What a tremendous feat it would be--what a scientific breakthrough--if he could obtain unshakable evidence that these tracks were not the work of a prankster, but the actual mark of a hitherto unknown creature! If he succeeded, he would be famous! And rich!

"Alas, fame and fortune were not gained that year, nor the next, nor the next. Patterson invested thousands of hours and dollars combing Bigfoot and Sasquatch territory. He fought constant ridicule and a shortage of funds. . . . he founded ... The Northwest Research Foundation. Through it he solicited funds .... The response was encouraging and enabled him to lead several expeditions .... In 1966 he published a paperback book at his own expense . . . . He added the income from its sales and his lectures to the search fund. As each wilderness jaunt failed to see or capture the monster, one by one the thrill-seekers dropped out. But Patterson never gave up."

Patterson's book, Do Abominable Snowmen of America Really Exist?, was self-published in 1966. The book has been characterized as "little more than a collection of newspaper clippings laced together with Patterson's circus-poster style prose." The book, however, did include 20 pages of previously unpublished interviews and letters, 17 drawings by Patterson of the encounters described in the text, 5 hand-drawn maps (rare in subsequent Bigfoot books), and almost 20 photos and illustrations from other sources. It was first reprinted in 1996 by Chris Murphy (under his publishing company, Pyramid Productions) in a very limited number (approx. 200, according to Murphy), and then again re-issued by Murphy (under Hancock House Publishing) in 2005 under the title The Bigfoot Film Controversy, with 81 pages of additional material by Murphy.

In 1995, almost three decades after the Patterson–Gimlin filming, investigative journalist Greg Long started years of interviewing people who knew Patterson, some of whom described him as a liar and a conman. Pat Mason, Glen Koelling,  and Bob Swanson  suffered financially from their dealings with him. Vilma Radford claimed Patterson never repaid a loan made to him for a Bigfoot movie Roger was planning. Radford had corroborative evidence: a $700 promissory note "for expenses in connection with filming of 'Bigfoot: America's Abominable Snowman.'" Patterson had agreed to repay her $850, plus 5 percent of any profits from the movie. (In 1974, Bob Gimlin, with René Dahinden's financial assistance, sued DeAtley and Patterson's widow, Patricia, claiming he had not received his one-third share of the film's proceeds. He won his case in 1976.)

A less harsh characterization of Patterson can be found in other texts.

The movie was supposed to be a pseudo-documentary or docudrama about cowboys being led by an old miner and a wise Indian tracker on a hunt for Bigfoot. The storyline called for Patterson, his Indian guide (Gimlin in a wig), and the cowboys to recall in flashbacks the stories of Fred Beck (of the 1924 Ape Canyon incident) and others as they tracked the beast on horseback. For actors and cameraman, Patterson used at least eight volunteer acquaintances, including Gimlin and Heironimus, for three days of shooting. Lacking a cooperative Bigfoot, Patterson would have needed a costume to represent one, if the time came to shoot such climactic scenes.

According to rockabilly songwriter and guitarist Jerry Lee Merritt, Patterson's neighbor and collaborator on his Bigfoot "documentary," both he and Roger tried to attract investors to help further fund his Bigfoot movie. They were not successful at this. Roger drove to Hollywood often. He and Merritt visited various friends in the entertainment field including Ross Hagen (who starred on the late 1960s hit television show Daktari), and who worked with Patterson on his Bigfoot song they recorded in Hollywood.

Patterson and his friend Gimlin set out for the Six Rivers National Forest in northern California. Patterson chose the area because of intermittent reports of the creatures in the past and of their enormous footprints near there since 1958. The most recent of these reports was the nearby Blue Creek Mountain track find, which was investigated by journalist John Green, Bigfoot hunter René Dahinden, and archaeologist Don Abbott on and after August 28, 1967. This find was reported to Patterson soon thereafter by Al Hodgson, owner of the Willow Creek Variety Store, a general store.

Though Gimlin says he doubted the existence of Sasquatch-like creatures, he agreed to Patterson's suggestion that they should not attempt to shoot any such creatures they might see.

The encounter
According to Patterson and Gimlin, they were the only witnesses to their brief encounter with what they claimed was a Sasquatch. Their statements agree in general, but Long notes a number of inconsistencies. They offered somewhat different sequences in describing how they and the horses reacted upon seeing the creature. Patterson in particular increased his estimates of the creature's size in subsequent retellings of the encounter. In a different context, Long argues, these discrepancies would probably be considered minor, but given the extraordinary claims made by Patterson and Gimlin, any apparent disagreements in perception or memory are worth noting.

As their stories went, in the early afternoon of Friday, October 20, Patterson and Gimlin were riding generally north (upstream) on horseback along Bluff Creek. At sometime between 1:15 and 1:40 PM they "came to an overturned tree with a large root system at a turn in the creek, almost as high as a room." When they rounded it, "there was a logjam--a 'crow's nest'-- left over from the flood of '64," and then they spotted the figure behind it nearly simultaneously, while it was either "crouching beside the creek to their left" or "standing" there. Gimlin later described himself as in a mild state of shock after first seeing the figure.

Patterson initially estimated its height at six and one-half to seven feet, and later raised his estimate to about seven and one-half feet. (Some later analysts, anthropologist Grover Krantz among them, have suggested Patterson's later estimate was about a foot too tall.) The film shows what Patterson and Gimlin claimed was a large, hairy, bipedal, apelike figure with short, "silvery brown" or "dark reddish-brown" or "black" hair covering most of its body, including its prominent breasts. The figure in the Patterson–Gimlin film generally matches the descriptions of Bigfoot offered by others who claim to have seen one.

Patterson estimated he was about 25 ft (7.6 m) away from the creature at his closest. Patterson said that his horse reared upon seeing (or perhaps smelling) the figure, and he spent about twenty seconds extricating himself from the saddle and getting his camera from a saddlebag before he could run toward the figure while operating his camera. He yelled "Cover me" to Gimlin, who thereupon crossed the creek on horseback, rode forward a while, and, rifle in hand, dismounted (presumably because his horse might have panicked if the creature charged, spoiling his shot).

The figure had walked away from them to a distance of about 120 ft (36.5 m) before Patterson began to run after it. The resulting film (about 59.5 seconds long at 16 fps) is initially quite shaky until Patterson got about 80 ft (24.4 m) from the figure. At that point, the figure glanced over its right shoulder at the men and Patterson fell to his knees; on Krantz's map this corresponds to frame 264. To researcher John Green, Patterson would later characterize the creature's expression as one of "contempt and disgust...you know how it is when the umpire tells you 'one more word and you're out of the game.' That's the way it felt."

At this point the steady, middle portion of the film begins, containing the famous frame 352 (see accompanying photo above). Patterson said "it turned a total of I think three times," the first time therefore being before the filming began. Shortly after glancing over its shoulder, the creature walked behind a grove of trees, reappeared for a while after Patterson moved ten feet to a better vantage point, then faded into the trees again and was lost to view as the reel of film ran out. Gimlin remounted and followed it on horseback, keeping his distance, until it disappeared around a bend in the road three hundred yards away. Patterson called him back at that point, feeling vulnerable on foot without a rifle, because he feared the creature's mate might approach. The entire encounter had lasted less than two minutes.

Next, Gimlin rounded up Patterson's horses, which had run off in the opposite direction, downstream, before the filming began, and the men then tracked it for either one mile or three miles (5 km), but "lost it in the heavy undergrowth." They returned to the initial site, measured the creature's stride and made two plaster casts (of the best-quality right and left prints).

About 6:30 PM, Patterson met up with Al Hodgson at his store. Patterson intended to drive on to an airstrip north of Eureka to ship his film. Either at that time, or when he arrived at the airport, he called Al DeAtley and told him to expect the reels he was shipping. He requested Hodgson to call Donald Abbott, whom Krantz described as "the only scientist of any stature to have demonstrated any serious interest in the [Bigfoot] subject," hoping he would help them search for the creature. Hodgson called, but Abbott declined. Krantz argued that this call the same day of the encounter is evidence against a hoax, at least on Patterson's part.

They headed back toward their camp, where they had left their horses. On their way they "stopped at the Lower Trinity Ranger Station, as planned, arriving about 9:00 p.m. Here they met with Syl McCoy (another friend) and Al Hodgson." At this point Patterson called the daily Times-Standard newspaper in Eureka and related his story. At 5:30 the next morning, after it started to rain heavily, Gimlin returned to the filmsite from the camp and covered the other prints with bark to protect them. When he returned to the camp he and Patterson aborted their plan to remain looking for more evidence and departed for home, fearing the rain would wash out their exit roads.

US Forestry Service "timber management assistant" Lyle Laverty said, "I [and his team of three, in a jeep] passed the site on either Thursday the 19th or Friday the 20th" and noticed no tracks. After reading the news of Patterson's encounter on their weekend break, Laverty and his team returned to the site on Monday and photographed the tracks. Taxidermist and outdoorsman Robert Titmus went to the site with his brother-in-law nine days later. Titmus made casts of the creature's prints and, as best he could, plotted Patterson's and the creature's movements on a map.

Aftermath
Patterson's expensive ($369) 16 mm camera had been rented on May 13, but he had kept it longer than the contract had stipulated, and an arrest warrant had been issued for him on October 17. This charge was ultimately dismissed, in 1969, after Patterson returned the camera in working order.

Krantz writes that "Patterson had the film developed as soon as possible. At first he thought he had brought in proof of Bigfoot's existence and really expected the scientists to accept it. But only a few scientists were willing to even look at the film," usually at showings at scientific organizations. (These were usually arranged at the behest of zoologist, author, and media figure Ivan Sanderson, a supporter of Patterson's film. Seven showings occurred, in Vancouver, Manhattan, the Bronx, Washington, DC, Atlanta, Washington, DC  again (all by the end of 1968); and, later, in Beaverton, Oregon.) Of those who were quoted, most expressed various reservations, although some were willing to say they were intrigued by it.

Christopher Murphy wrote, "Dahinden traveled to Europe in 1971. He visited England, Finland, Sweden, Switzerland and Russia. Although scientists in these countries were somewhat more open-minded than those in North America, their findings were basically the same .... A real glimmer of hope, however, emerged [in Russia]."

Though there was little scientific interest in the film, Patterson was still able to capitalize on it. He incorporated it as the centerpiece of the documentary film that he had set out to make in the first place." This film was shown in local movie houses around the Pacific Northwest and Midwest. A technique commonly used for nature films called "four-walling" was employed, involving heavy local advertising, mostly on TV, of a few days of showings. It was a modest financial success. Al DeAtley estimated that his 50% of the film's profits amounted to $75,000. But Glen Koelling said, "It was my understanding that his [Roger's] brother-in-law made quite a bit of money off that movie. And Roger didn't get his share of it. . . . Roger told me, and several other people too, you know, that I trust." And Bigfoot-book author Michael McLeod concluded similarly.

The film generated a fair amount of national publicity. Patterson appeared on a few popular TV talk shows to promote the film and belief in Bigfoot by showing excerpts from it: for instance, on the Joe Pyne Show in Los Angeles, in 1967, which covered most of the western US; on Merv Griffin's program, with Krantz offering his analysis of the film; on Joey Bishop's talk show, and also on Johnny Carson's Tonight show. Articles on the film appeared in Argosy, National Wildlife, and Reader's Digest. Patterson also appeared on at least one broadcast interview on local stations in the Pacific Northwest. That interview, with Gimlin, by Vancouver-based Jack Webster in November 1967, was partly recorded by John Green and reprinted in Loren Coleman's Bigfoot!

Patterson subsequently sold overlapping distribution rights for the film to several parties, which resulted in costly legal entanglements.

While Patterson sought publicity, Gimlin was conspicuous by his absence. He only briefly helped to promote the film and avoided discussing his Bigfoot encounter publicly for many subsequent years; he turned down requests for interviews. He later reported that he had avoided publicity after Patterson and promoter Al DeAtley had broken their agreement to pay him a one-third share of any profits generated by the film.

Daegling wrote, "Bigfoot advocates emphasize that Patterson remained an active Bigfoot hunter up until his death." For instance, in 1969, he hired a pair of brothers to travel around in a truck chasing down leads to Bigfoot witnesses and interviewing them. Later, in December of that year, he was one of those present in Bossburg, Washington in the aftermath of the cripplefoot tracks found there.

Krantz reports that "[a] few years after the film was made, Patterson received a letter from a man ["a US airman stationed in Thailand" ] who assured him a Sasquatch was being held in a Buddhist monastery. Patterson spent most of his remaining money preparing an expedition to retrieve this creature" only to learn it was a hoax. He learned this only after having sent Dennis Jenson fruitlessly to Thailand (where he concluded that the airman was "mentally unbalanced") and then, after receiving a second untrue letter from the man, going himself to Thailand with Jenson.

To obtain money to travel to Thailand, "Patterson called Ron, who had returned to ANE, and sold the company the theatrical rights to the clip for what Olson described as a pretty good sum of money."

Patterson died of Hodgkin's lymphoma in 1972. According to Michael McLeod and Bill Munns, "A few days before Roger died, he told [Bigfoot-book author Peter] Byrne that in retrospect, . . . he would have shot the thing and brought out a body instead of a reel of film." According to Grover Krantz and Robert Pyle, years later, Patterson and Gimlin agreed they should have tried to shoot the creature, both for financial gain and to silence naysayers.

After his death, "With the consent of Al DeAtley and Patricia Patterson, the film distributor Ron Olson took over the operation of Northwest Research . . . and changed its name to the North American Wildlife Research Association. . . . he worked full-time compiling reports, soliciting volunteers to join the hunt, and organizing several small expeditions. A trap Olson and his crew built still survives . . . . Olson . . . continued to lobby the company [ANE] to produce a Bigfoot film. . . . In 1974 . . . ANE finally agreed. . . . [It was released in 1975,] titled Bigfoot: Man or Beast. [H]e devised a storyline involving members of a Bigfoot research party . . . . The film comes to a frightful end when a Bigfoot terrorized the expedition at night. Olson spent several years exhibiting the film around the country. He planned to make millions with the film, but says it lost money."

"During the Thanksgiving holiday of 1974, CBS aired Mysterious Monsters, a documentary about the Loch Ness Monster and Bigfoot. (It was co-produced by the Smithsonian ....) The show attracted sixty million viewers, making it the highest-rated program of the week. Sunn [sic--should be "Sun"] took the documentary on a four-wall tour ...." This show included footage from the Patterson–Gimlin film.

Legal status
Greg Long reports that a 1978 legal "settlement gave Dahinden controlling rights--51 percent of the film footage, 51 percent of video cassette rights, and 100 percent of all 952 frames of the footage. Patty Patterson had 100 percent of all TV rights and 49 percent rights in the film footage. Dahinden had ... bought out Gimlin, who himself had received nothing from Patterson; and Mason and Radford, promised part of the profits by Patterson, had nothing to show for their investment or efforts." Frame 352, the well-known look-back image, is in the public domain, having long been reprinted by others without protest by the copyright holder.

Ownership of physical films
The whereabouts of the original is unknown, although there are several speculations, mostly online, as to what happened to it. Patterson had ceded ownership of the original to American National Enterprises, which went bankrupt a few years after his death in 1972. Thereafter, the company's assets were auctioned off. Chris Murphy thinks a Florida lawyer may have the film. Munns's book says the trail ends either in a film storage vault in Southern California or with René Dahinden.

At least seven copies were made of the original film: For more information about those copies, and about the second-generation copies made from them, see Bill Munns's When Roger Met Patty, Appendix 2, pp. 387–99.
 * René Dahinden possessed one of the copies up until his death. The film now is in possession of Dahinden's family.
 * Green still owns his copy.
 * Krantz's copy "went to the Smithsonian when he died."
 * Beckjord (now deceased) offered his copy for sale for $1 million; it is not known if it was sold or what has become of it.
 * Peter Byrne is still alive; if he sold or donated his copy, there has been no news of that.
 * A copy was made for American National Enterprises (ANE), for use in making its commercialized documentary.
 * Mrs. Patterson also has a copy in a bank vault, to which she granted access to Munns for his analytical work.

The second reel, showing Patterson and Gimlin making and displaying plaster casts of some footprints, was not shown in conjunction with the first reel at Al DeAtley's house, according to those who were there. Chris Murphy wrote, "I believe the screening of this roll at the University of British Columbia on October 26, 1967 was the first and last major screening." It has subsequently been lost. One account is that the BBC borrowed it to make a documentary and failed to return it. If so, it is likely lost for good, when the BBC engaged in a massive housecleaning of its video archives decades ago. A ten-foot strip from that reel, or from a copy of that reel, from which still images were taken by Chris Murphy, still exists, but it too has gone missing.

Filming speed
One fact which complicates discussion of the Patterson film is that Patterson says he normally filmed at 24 frames per second, but in his haste to capture the Bigfoot on film, he did not note the camera's setting. His Cine-Kodak K-100 camera had markings on its continuously variable dial at 16, 24, 32, 48, and 64 frames per second, but no click-stops, and was capable of filming at any frame speed within this range. Grover Krantz wrote, "Patterson clearly told John Green that he found, after the filming, that the camera was set on 18 frames per second (fps) . . . ." (It has been suggested that Patterson simply misread 16 as 18.)

"Dr. D.W. Grieve, an anatomist with expertise in human biomechanics ... evaluated the various possibilities" regarding film speed and did not come to a conclusion between them. He "confessed to being perplexed and unsettled" by "the tangible possibility that it [the film subject] was real."

Primatologist John Napier claimed that "if the movie was filmed at 24 frame/s then the creature's walk cannot be distinguished from a normal human walk. If it was filmed at 16 or 18 frame/s, there are a number of important respects in which it is quite unlike man's gait." Napier, who published before Dahinden and Krantz, contended it was "likely that Patterson would have used 24 frame/s" because it "is best suited to TV transmission," while conceding that "this is entirely speculative."

Krantz argued, on the basis of an analysis by Igor Bourtsev, that since Patterson's height is known, a reasonable calculation can be made of his pace. This running pace can be synchronized with the regular bounces in the initial jumpy portions of the film that were caused by each fast step Patterson took to approach the creature. On the basis of this analysis, Krantz argued that a speed of 24 frames per second can be quickly dismissed and that "[we] may safely rule out 16 frames per second and accept the speed of 18."

Dahinden stated that "the footage of the horses prior to the Bigfoot film looks jerky and unnatural when projected at 24 frame/s." And Dahinden experimented at the film site by having people walk rapidly over the creature's path and reported: "None of us ... could walk that distance in 40 seconds [952 frames / 24 frame/s = 39.6 s], ... so I eliminated 24 frame/s."

Analysis
The Patterson–Gimlin film has seen relatively little interest from mainstream scientists. As anthropologist David Daegling writes, "[t]he skeptics have not felt compelled to offer much of a detailed argument against the film; the burden of proof, rightly enough, should lie with the advocates." Yet, without a detailed argument against authenticity, Daegling notes that "the film has not gone away." Similarly, Krantz argues that of the many opinions offered about the Patterson film, "[o]nly a few of these opinions are based on technical expertise and careful study of the film itself."

Numerous statements of scientists who viewed the film at a screening, or who conducted a study, are reprinted in Chris Murphy's Bigfoot Film Journal.

Neither humans nor chimpanzees have hairy breasts as does the figure in the film, and critics have argued these features are evidence against authenticity. Napier has noted that a sagittal crest is "only very occasionally seen, to an insignificant extent, in chimpanzees [sic] females." Krantz countered this as follows: "a sagittal crest ... is a consequence of absolute size alone."

Dmitri Bayanov et al.
Dimitri Bayanov, Igor Bourtsev, and René Dahinden authored "Analysis of the Patterson–Gimlin Film, Why We Find It Authentic." It is a study with sections examing the technical characteristics of the footage, the filming speed, the morphology of the creature, and the specimen's movements. It ended with an assessment and a conclusion favorable to the film subject's reality. The most notable sentences are these: "[Sculptor Nikita Lavinsky argues that] the better a costume from the anatomical point of view, the worse it would be from the viewpoint of biomechanics. A clever costume on a moving hoaxer would expose, not conceal a fraud."

Dmitri Donskoy
A formal academic study of the Patterson film was conducted by Dmitri Donskoy, Chief of the Dept. of Biomechanics at the USSR Central Institute of Physical Culture, and later associated with Moscow's Darwin Museum.

Donskoy concluded the creature was non-human on the basis of its weight, and especially its gait, which Donskoy judged would be difficult, if not impossible, for a human to replicate. He inferred the film's subject was weighty from the ponderous momentum he observed in the movements of its arms and legs, in the sagging of the knee as weight came onto it, and in the flatness of the foot. Its gait he considered non-artificial because it was confident and unwavering, "neatly expressive," and well-coordinated, and yet non-human because its arm motion and glide resembled a cross-country skier's. Krantz describes Donskoy's conclusion as being that the film depicts "a very massive animal that is definitely not a human being."

Jeff Glickman
Glickman is a Certified Forensic Examiner who "performed intensive computer analysis on the Patterson/Gimlin film over a period of three years." His 43-page study, written in a scientific format, contains 13 pages about the film. He gave estimated measurements of the creature, including a very high weight estimate that few have accepted. He was unable to find evidence of fakery, but noted several indications of authenticity. His conclusions are summed up on one page in two of Christopher Murphy's books. Background information on Glickman's project, sponsored by the North American Science Institute (NASI), can be found in another of Murphy's books.

Grover Krantz
Anthropologist Grover Krantz offered an in-depth examination of the Patterson film. He concluded that the film depicts a genuine unknown creature. Primarily, Krantz's argument is based on a detailed analysis of the figure's stride, center of gravity, and biomechanics. Krantz argues that the creature's leg and foot motions are quite different from a human's and could not have been duplicated by a person wearing a gorilla suit. Krantz wrote, "the knee is regularly bent more than 90°, while the human leg bends less than 70°." Daniel Perez brought out the implication of this, writing, "The subject['s] ... toes lift off the soil at least ten inches in every walking cycle. ... René Dahinden ... filmed and studied how modern man walks, finding ... a maximum of 2–3 inches of distance between toes and the surface it is walking over . . . ." No human has yet replicated this level lower leg lift while maintaining the smoothness, posture, and stride length (41") of the creature.

Krantz pointed out the tremendous width of the creature's shoulders, which (after deducting 1" for hair) he estimated at 28.2 inches, or 35.1% of its full standing height of 78", or a higher percentage of its 72" "walking height," which was a bit stooped, crouched, and sunk into the sand. The creature's shoulders are almost 50% wider than the human mean. (For comparison, André the Giant had a typical human ratio of 24%. Wide-shouldered Bob Heironimus (see below) has 27.4%. Only very rarely do humans have a shoulder breadth of 30%.) Krantz argued that a suited person could not mimic this breadth and still have the naturalistic hand and arm motions present on the film.

Krantz and others have noted natural-looking musculature visible as the creature moved, arguing this would be highly difficult or impossible to fake. Hunter and Dahinden also note that "the bottom of the figure's head seems to become part of the heavy back and shoulder muscles... [and] the muscles of the buttocks were distinct"

Jeffrey Meldrum
Jeffrey Meldrum of Idaho State University cites efforts by John Green as important in his own studies of the Patterson film. "It has been obvious to even the casual viewer that the film subject possesses arms that are disproportionately long for its stature." Meldrum writes that "Anthropologists typically express limb proportions as an intermembral index (IM)" and notes that humans have an average IM index of 72, gorillas an average IM index of 117 and chimpanzees an average IM index of 106.

In determining an IM index for the figure in the Patterson film, Meldrum concludes the figure has "an IM index somewhere between 80 and 90, intermediate between humans and African apes. In spite of the imprecision of this preliminary estimate, it is well beyond the mean for humans and effectively rules out a man-in-a-suit explanation for the Patterson–Gimlin film without invoking an elaborate, if not inconceivable, prosthetic contrivance to account for the appropriate positions and actions of wrist and elbow and finger flexion visible on the film. This point deserves further examination and may well rule out the probability of hoaxing."

In his book, Meldrum says, "Steindorf tracked the joint centers through 116 frames of the film, yielding a reliable estimate of the film subject's limb proportions. ... The combination of these proportions with the exceptional breadth dimensions argue compellingly against the simplistic hypothesis of an average man, even one wearing shoulder pads ... or using artificial arm extensions."

However, scientist Esteban Sarmiento disagrees that the subject has a non-human IMI.

Reuben Steindorf
Jeff Meldrum wrote, "Animator and computer-generated effects expert Reuben Steindorf, of Vision Realm, created a computer model of 'Patty,' as the film subject has been nicknamed. ... Steindorf reconstructed Patty's skeletal anatomy from the ground up, using 'reverse kinematics.'" Among other findings, "Steindorf confirmed ... that the upper extremity was rather long compared to the lower. This ratio can be expressed as an intermembral index (IM). ... The intermembral index for the film subject was approximately 88. ... An average human IM is 71."

Gordon Strasenburgh
Gordon Strasenburgh authored "The Crested Australopithecus Robustus and the Patterson–Gimlin Film". After an introduction, it reviews four other studies and opinions by scientists on the film, then goes on with the following sections: Testing Hypotheses, Anthropological Attitudes, Alternatives to A. robustus, The Basic Problem, and Conclusion. The last section begins, "The Patterson–Gimlin film and its analytical results to date are the best data."

David J. Daegling and Daniel O. Schmitt
When anthropologists David J. Daegling of the University of Florida and Daniel O. Schmitt examined the film, they concluded it was impossible to conclusively determine if the subject in the film is nonhuman, and additionally argued that flaws in the studies by Krantz and others invalidated their claims. Daegling and Schmitt noted problems of uncertainties in subject and camera positions, camera movement, poor image quality, and artifacts of subject. They concluded: "Based on our analysis of gait and problems inherent in estimating subject dimensions, it is our opinion that it is not possible to evaluate the identity of the film subject with any confidence."

Daegling has asserted that the creature's odd walk could be replicated: "Supposed peculiarities of subject speed, stride length, and posture are all reproducible by a human being employing this type of locomotion [a "compliant gait"]."

Daegling notes that in 1967, movie and television special effects were primitive compared to the more sophisticated effects in later decades, and allows that if the Patterson film depicts a man in a suit that "it is not unreasonable to suggest that it is better than some of the tackier monster outfits that got thrown together for television at that time."

D.W. Grieve
Anatomist D.W. Grieve of the Royal Free Hospital School of Medicine studied a copy of the film in 1971, and wrote a detailed analysis. He notes, "The possibility of a very clever fake cannot be ruled out on the evidence of the film" but also writes that his analysis hinges largely on the question of filming speed.

Grieve concluded that "the possibility of fakery is ruled out if the speed of the film was 16 or 18 frames per second. In these conditions a normal human being could not duplicate the observed pattern, which would suggest that the Sasquatch must possess a very different locomotor system to that of man." If filmed at the higher speed, Grieve concluded that the creature "walked with a gait pattern very similar in most respects to a man walking at high speed."

Grieve stated, "I can see the muscle masses in the appropriate places... If it is a fake, it is an extremely clever one." Like Krantz, Grieve thought the figure's shoulders were quite broad. Also like Krantz, Grieve thought Patterson's estimate of the figure's height was inaccurate. Grieve concluded the figure in the Patterson film revealed "an estimated standing height for the subject of not more than 6 ft." He notes that a tall human is consistent with the figure's height but also notes that for a tall human "[t]he shoulder breadth however would be difficult to achieve without giving an unnatural appearance to the arm swing and shoulder contours."

Grieve notes that his "subjective impressions have oscillated between total acceptance of the Sasquatch based on the grounds that the film would be difficult to fake, to one of irrational rejection based on an emotional response to the possibility that the Sasquatch actually exists. This seems worth stating because others have reacted similarly to the film."

Krantz claimed Grieve made errors in his measurements and reference points. Green criticized his measurements and his reasoning.

Bernard Heuvelmans
Bernard Heuvelmans —a zoologist and the so-called "father of cryptozoology" —thought the creature in the Patterson film was a suited human. He objected to the film subject's hair-flow pattern as being too uniform; to the hair on the breasts as not like a primate; to its buttocks as being insufficiently separated; and to its too-calm retreat from the pursuing men.

John Napier
Prominent primate expert John Napier (one-time director of the Smithsonian's Primate Biology Program) was one of the few mainstream scientists not only to critique the Patterson–Gimlin film but also to study then-available Bigfoot evidence in a generally sympathetic manner in his 1973 book, Bigfoot: The Sasquatch and Yeti in Myth and Reality.

Napier conceded the likelihood of Bigfoot as a real creature, stating, "I am convinced that Sasquatch exists." But he argued against the film being genuine: "There is little doubt that the scientific evidence taken collectively points to a hoax of some kind. The creature shown in the film does not stand up well to functional analysis." Napier gives several reasons for his and other's skepticism, which are commonly raised, but apparently his main reasons are ones that are original with him. First, the length of "the footprints are totally at variance with its calculated height." Second, the footprints are of the "hourglass" type, which he is suspicious of. Barbara Wasson criticized Napier's logic at length.

He adds, "I could not see the zipper; and I still can't. There I think we must leave the matter. Perhaps it was a man dressed up in a monkey-skin; if so it was a brilliantly executed hoax and the unknown perpetrator will take his place with the great hoaxers of the world. Perhaps it was the first film of a new type of hominid, quite unknown to science, in which case Roger Patterson deserves to rank with Dubois, the discoverer of Pithecanthropus erectus, or Raymond Dart of Johannesburg, the man who introduced the world to its immediate human ancestor, Australopithecus africanus."

Jessica Rose and James Gamble
Jessica Rose and James Gamble are authors of "the definitive text on human gait", Human Walking. They operate the Motion and Gait Analysis Lab at Stanford University. They conducted a high-tech human-replication attempt of "Patty's" gait, in cooperation with Jeff Meldrum. Rose was certain their subject had matched Patty's gait, while Gamble was not quite as sure. Meldrum was impressed and acknowledged that "some aspects" of the creature's walk had been replicated, but not all. The narrator said, "even the experts can see the gait test could not replicate all parameters of the gait." It was shown in an episode of the Discovery Channel's Best Evidence series.

Esteban Sarmiento
Esteban Sarmiento is a specialist in physical anthropology at the American Museum of Natural History. He has 25 years of experience with great apes in the wild. He writes, "I did find some inconsistencies in appearance and behavior that might suggest a fake ... but nothing that conclusively shows that this is the case." His most original criticism is this: "The plantar surface of the feet is decidedly pale, but the palm of the hand seems to be dark. There is no mammal I know of in which the plantar sole differs so drastically in color from the palm." His most controversial statements are these: "The gluteals, although large, fail to show a humanlike cleft (or crack)." "Body proportions: ... In all of the above relative values, bigfoot is well within the human range and differs markedly from any living ape and from the 'australopithecine' fossils." (E.g., the IM index is in the normal human range.) And: "I estimate bigfoot's weight to be between 190 and 240 lbs."

M.K. Davis
Developments in computer technology permitted enhancements of the Patterson–Gimlin films to be made. Bigfoot enthusiast M.K. Davis created a version that removes the shakiness of the camera, permitting the creature to be seen from a more stable perspective. Davis has produced a second stabilized version incorporating enlargements of specific elements that he believes are significant.

Nike researcher Gordon Valient
Krantz also showed the film to Gordon Valient, a researcher for Nike shoes, who he says "made some rather useful observations about some rather unhuman movements he could see."

MonsterQuest
A first-season episode of MonsterQuest focuses on the Bigfoot phenomenon. One pair of scientists, Jurgen Konczak and Estaban Sarmiento, attempts and fails to get an actor outfitted with LEDs on his joints to mimic the Patterson Bigfoot's gait. A second pair, Daris Swindler and Owen Caddy, employs digital enhancement and observes facial movements, such as moving eyelids, lips that compress like an upset chimp's, and a mouth that is lower than it appears, due to a false-lip anomaly like that of a chimp's. (The show's narrator falsely claims, three times, that the original film shot by Patterson was used.) The episode concludes, "the new findings are intriguing but inconclusive, until a body is found."

Movie production companies' executives

 * Dale Sheets and Universal Studios. Patterson, Gimlin, and DeAtley are said to have screened the film for Dale Sheets, head of the Documentary Film Department, and unnamed technicians "in the special effects department at Universal Studios in Hollywood ... Their conclusion was: 'We could try (faking it), but we would have to create a completely new system of artificial muscles and find an actor who could be trained to walk like that. It might be done, but we would have to say that it would be almost impossible.'" A more moderate version of their opinion was, "if it is [a man in an ape suit], it's a very good one--a job that would take a lot of time and money to produce." In addition, Daegling wrote: "Peter Byrne, in an e-mail; to the author September 8, 2002, indicates that he personally talked to the Disney people. . . . Green followed up with the Disney Studios in 1969."


 * Disney executive Ken Peterson. Krantz reports that in 1969, John Green (who owned a first-generation copy of the original Patterson film) interviewed Disney executive Ken Peterson, who, after viewing the Patterson film, asserted "that their technicians would not be able to duplicate the film." Krantz argues that if Disney personnel were unable to duplicate the film, there is little likelihood that Patterson could have done so.

Bill Munns
Bill Munns, retired, was a special effects and make-up artist, cameraman, and film editor. He argues that Universal and Disney were not the most knowledgeable studios to consult with. He says that Fox, MGM, and special effects artist Stuart Freeborn in England would have been preferable.

Munns started posting his online analysis of the film in 2009 and summarizing it in the online Munns Report. In 2014, Munns self-published When Roger Met Patty, a 488-page book that analyses the film and film subject from various perspectives. He argues the film depicts a non-human animal, not a man in a fur suit. He proposes a new diagnostic test of authenticity, at the armpit: natural concave skin fold vs. artificial vertical crease. Munns' analysis has been featured in an episode of the History Channel series MonsterQuest.

Other special effects artists

 * Rick Baker. "Famed Hollywood creator of 'Harry' (from the movie, Harry and the Hendersons), Rick Baker, told Geraldo Rivera's "Now It Can Be Told" show (in 1992) that "it looked like cheap, fake fur," after seeing the subject in Patterson's filmstrip."


 * Ellis Burman. The Guenettes wrote of him, "I also spoke to Ellis Burman of Burman Studios in Hollywood, creators of all kinds of strange creatures, including a fake Bigfoot for a traveling 'pickle and punk' carnival exhibit. Burman denied his company created the Patterson Bigfoot, but did say he could duplicate it--but for more than $10,000 in total costs."


 * John Chambers. Academy Award–winning monster-maker John Chambers is most famous for his innovative flexible masks in "Planet of the Apes" (1968). In a 1997 interview in a nursing home with Bigfooter Bobbie Short, he denied rumors that he had created a costume for the Patterson subject, saying "I'm good, but not that good."   Some time before 1976 the Guenettes reported that, in answer to their questions, "He concluded that if the creature is a man in a suit, then it is no ordinary gorilla suit. It is not something they bought or rented in a store; it would have to be something tailor made. He also felt like it might have been made out of real animal fur."


 * Janos Prohaska. After viewing the Patterson–Gimlin film with John Green, costume designer and ape-suit mime Janos Prohaska (noted for his work in the late-1960s television programs Star Trek and Lost in Space) concluded the film's subject looked real to him. When asked if he thought the film was faked, Prohaska replied, "I don't think so ... to me it looks very very real." If the film was hoaxed, Prohaska thought, it was remarkably realistic and sophisticated, and the best costume he had ever seen, and the only plausible explanation was that someone might have glued false hair "directly to the actor's skin." However, film critic David Daegling speculates that the same effect could be had by gluing the hair to a set of tight but expandable, waffle-design long johns.


 * Chris Walas. Academy Award winning "makeup artist Chris in the BigfootForums [site] (in 2004) presented a theory presented a theory that the arching hip line represents the overlap line between a fur costume leggings section and the torso section . . . ."


 * Stan Winston. Academy Award-winning film special effects supervisor and makeup artist Stan Winston, after viewing the PGF, said "it's a guy in a bad hair suit, sorry!" He also added that "if one of my colleagues created this for a movie, he would be out of business." He went on to comment that the suit in the film could have been made today for "a couple hundred dollars" or "under a thousand, in that day".

Hoax allegations
The major hoax allegations are summarized and criticized in: Online, it is possible to find analyses of images from the film that point to certain characteristics as indicative of a costume, or at least as consistent with one. It is also possible to find textual critiques of the statements and behavior of Patterson and/or Gimlin. (And there are online counterpoints to these points, as well as analyses that point to certain subject-characteristics as incompatible with a costume.)
 * Two of Christopher Murphy's books.
 * Loren Coleman's Bigfoot!: The True Story of Apes in America.
 * David Daegling's "Bigfoot Exposed."

Patterson and/or Gimlin
Patterson and Gimlin both denied that they had perpetrated a hoax, but in a 1999 telephone interview with television producer Chris Packham for the BBC's The X Creatures, Gimlin said that for some time, "I was totally convinced no one could fool me. And of course I'm an older man now...and I think there could have been the possibility [of a hoax]. But it would have to be really well planned by Roger [Patterson]."

Anthropologist David Daegling writes that the "more cynical skeptics" see Patterson's luck as "more than a little suspicious: He sets out to make a Bigfoot documentary, then almost literally stumbles across a Bigfoot." Daegling, however, offers the benefit of the doubt, noting that Patterson's reasoning is sound: In seeking something elusive, he went to where it had been reported. Bluff Creek had also been the site of well-known Bigfoot hoaxer Ray Wallace in 1958. In Patterson's book, he mentions meeting with Wallace once. Later, Daegling cites certain features in the film and the storyline as suspicious.

Krantz thought Patterson might have perpetrated such a hoax, given the opportunity and resources, but he also argued that Patterson had "nowhere near the knowledge or facilities to do so—nor for that matter, did anyone else ... When I talked about some of the more technical details of biomechanics, he (Patterson) showed the familiar blank look of a student who had lost the drift of the explanation, but was still trying hard to pay attention. Yet he must have known all these details to create a hoax. For instance, he could see the anterior position of the front of the shin, but how that related to foot leverage was quite beyond him." It must be noted, however, that Roger was an accomplished 2-D artist. His drawings and painting of horses and other wildlife showed a detailed understanding of musculature and anatomy.

Peter Byrne, who interviewed Patterson and Gimlin many times, wrote, "both men lacked, primarily, the intellectual capacity essential to the production of a hoax ... termed a masterpiece." Similarly, Daegling writes that "Most acquaintances of Patterson volunteered that neither he nor Gimlin were clever enough to put something that detailed together."

Philip Morris
In 2002, Philip Morris of Morris Costumes (a North Carolina-based company offering costumes, props and stage products) claimed that he made a gorilla costume that was used in the Patterson film. Morris says he discussed his role in the hoax "at costume conventions, lectures, [and] magician conventions" in the 1980s, but first addressed the public at large on August 16, 2002, on Charlotte, North Carolina, radio station WBT-AM. His story was also printed in The Charlotte Observer. Morris claims he was reluctant to expose the hoax earlier for fear of harming his business: giving away a performer's secrets, he said, would be widely regarded as disreputable.

Morris said that he sold an ape suit to Patterson via mail-order in 1967, thinking it was going to be used in what Patterson described as a "prank." (Ordinarily the gorilla suits he sold were used for a popular side-show routine that depicted an attractive woman changing into a gorilla.) After the initial sale, Morris said that Patterson telephoned him asking how to make the "shoulders more massive" and the "arms longer." Morris says he suggested that whoever wore the suit should wear football shoulder pads and hold sticks in his hands within the suit.

As for the creature's walk, Morris said:

The Bigfoot researchers say that no human can walk that way in the film. Oh, yes they can! When you're wearing long clown's feet, you can't place the ball of your foot down first. You have to put your foot down flat. Otherwise, you'll stumble. Another thing, when you put on the gorilla head, you can only turn your head maybe a quarter of the way. And to look behind you, you've got to turn your head and your shoulders and your hips. Plus, the shoulder pads in the suit are in the way of the jaw. That's why the Bigfoot turns and looks the way he does in the film. He has to twist his entire upper body.

Morris' wife and business partner Amy had vouched for her husband and claims to have helped frame the suit. Morris offered no evidence apart from testimony to support his account, the most conspicuous shortcoming being the absence of a gorilla suit or documentation that would match the detail evidenced in the film and could have been produced in 1967.

Bob Heironimus
Bob Heironimus claims to have been the figure depicted in the Patterson film. Heironimus says he had not previously publicly discussed his role in the hoax because he hoped to be repaid eventually and was afraid of being convicted of fraud had he confessed. After speaking with his lawyer he was told that since he had not been paid for his involvement in the hoax that he could not be held accountable.

He went public, via a press release by his lawyer, Barry Woodard, in a Yakima newspaper story. This was a month after watching the December 28, 1998 television special World's Greatest Hoaxes: Secrets Finally Revealed, stating, "I'm telling the truth. I'm tired after thirty-seven years." Six days later, a second newspaper story reported that his "lawyer's office has been inundated with calls from media outlets . . . . 'We're just sort of waiting for the dust to settle,' he said, explaining he and his client are evaluating offers." He also said that Heironimus's details would be forthcoming soon in a press conference—which did not happen.

His allegations were first detailed five years later, in Greg Long's book, The Making of Bigfoot, which includes testimony that corroborates Heironimus' claims:
 * Russ Bohannon, a longtime friend, says that Heironimus revealed the hoax privately in 1968 or 1969.


 * In separate incidents, Bernard Hammermeister and Heironimus' relatives (mother Opal and nephew John Miller) claim to have seen an ape suit in Heironimus' car. Opal said she saw the suit two days after the film was shot. No date was given by Long for Hammermeister's observation, but it apparently came well after the relatives' observation, as implied by the word "still" in the justification Heironimus gave Hammermeister for requesting his silence: "There was still supposed to be a payola on this thing, and he didn't have it."

Long argues that the suit Morris says he sold to Patterson was the same suit Heironimus claims to have worn in the Patterson film. However, Long quotes Heironimus and Morris describing ape suits that are in many respects quite different from each other. Among the notable differences are:
 * Heironimus says he was told by his brother Howard that Patterson claimed he manufactured the suit from horsehide. But Morris reports that the suit was his "standard suit that we sold to all our customers" that cost $435 (cheaper than the competition), with fur made of Dynel, a synthetic material. (Howard reported that the horsehide was a "real dark brown" and Long writes that Morris "used Dynel solely in the sixties—and was using brown Dynel in 1967." But Morris wouldn't have wanted a "dark" brown color, as he chose brown to contrast against the black background of the girl-to-gorilla illusion. )
 * Heironimus described the suit as having no metal pieces and an upper "torso part" that he donned "like putting on a T-shirt." At Bluff Creek he put on "the top." Asked about the "bottom portion," he guessed it was cinched with a drawstring. But Morris made a one-piece union suit with a metal zipper up the back. Presumably one stepped into it first, then wiggled in one's arms; in any event, donning it like a T-shirt would be impossible.
 * Heironimus described the suit as having hands and feet that were attached to the arms and legs. But Morris made a suit whose hands and feet were separate pieces. Long speculates that Patterson riveted or glued these parts to the suit, but offers no evidence to support this idea. If Patterson had done so, he must have done it before Heironimus did his test fitting and walk (because Heironimus describes a three-piece suit—head, torso, and legs, omitting separate hands and feet)--i.e., without adjusting their location to his dimensions. (And Heironimus never described being measured.)

Long speculates that Patterson modified the costume, and offers corroborating evidence and testimony to support this idea. But there's no evidence or testimony that Patterson changed the Morris suit to horsehide, or dyed it a darker color, or cut it in half at the waist, or riveted the hands and feet to the suit before test-fitting it.

Some film proponents  say that Heironimus' arms are too short to match that of a bigfoot and that he was a few inches shorter than the creature on the film (up to 14 inches shorter). But Heironimus said that he wore football shoulder pads, which might explain why the shoulders and arms appear to be out of proportion to the rest of the body. However, Heironimus disclaimed the use of arm-extending sticks in his costume and said that he wore "gloves, a little bit longer than my actual hands were ...." It has also been speculated that Heironimus was also not as bulky as the creature, but film critics claim that a suit could correct for that (and for height).

Ray Wallace
After the death of Ray Wallace in 2002, following a request by Loren Coleman to The Seattle Times reporter Bob Young to investigate, the family of Wallace went public with claims that he had started the Bigfoot phenomenon with fake footprints (made from a wooden foot-shaped cutout) left in Californian sites in 1958. In addition, David Daegling stated that Wallace "had a degree of involvement" with the Patterson–Gimlin film, and that this gave grounds for suspicion of it.

The evidence for this involvement is Wallace's alleged statement, "I felt sorry for Roger Patterson. He told me he had cancer of the lymph glands and he was desperately broke and he wanted to try to get something where he could have a little income. Well, he went down there exactly where I told him. I told him, 'You go down there and hang around on that bank. Stay up there and watch that spot.'"

Coleman has written that Patterson was an early Bigfoot investigator, and that it was only natural that he sought out and interviewed older Bigfoot event principals, which included Wallace, because of the 1958 Bluff Creek incidents. Coleman has asserted that Wallace had nothing to do with Patterson's footage in 1967, and has argued in an analysis of the media treatment of the death of Wallace that the international media inappropriately confused the Wallace films of the 1970s with the Patterson–Gimlin 1967 film.

Dr. Meldrum has written extensively about Wallace, his allegations (continued by his family after his death), and the significant problems with them in his book Sasquatch: Legend Meets Science.