User talk:Risayu

predators

some unbelievable predator

stingray fish
Stingrays are commonly found in the shallow coastal waters of temperate seas. They spend the majority of their time inactive, partially buried in sand, often moving only with the sway of the tide. The stingray's coloration commonly reflects the seafloor's shading, camouflaging it from predatory sharks and larger rays. Their flattened bodies are composed of pectoral fins joined to their head and trunk with an infamous tail trailing behind.

While the stingray's eyes peer out from its dorsal side, its mouth, nostrils, and gill slits are situated on its underbelly. Its eyes are therefore not thought by scientists to play a considerable role in hunting. Like its shark relatives, the stingray is outfitted with electrical sensors called ampullae of Lorenzini. Located around the stingray's mouth, these organs sense the natural electrical charges of potential prey. Many rays have jaw teeth to enable them to crush mollusks such as clams, oysters, and mussels.

When they are inclined to move, most stingrays swim by undulating their bodies like a wave; others flap their sides like wings. The tail may also be used to maneuver in the water, but its primary purpose is protection.

The stingray's spine, or barb, can be ominously fashioned with serrated edges and a sharp point. The underside may produce venom, which can be fatal to humans, and which can remain deadly even after the stingray's death. In Greek mythology, Odysseus, the great king of Ithaca, was killed when his son, Telegonus, struck him using a spear tipped with the spine of a stingray

Fast Facts

Type: Fish Diet: Carnivore Average life span in the wild: 15 to 25 years Size: Up to 6.5 ft (2 m) Weight: Up to 790 lbs (350 kg) Protection status: Threatened Did you know? Ancient Greek dentists used the venom from the stingray's spine as an anesthetic. Size relative to a 6-ft (2-m) man:

komodo dragon
Komodo dragons have thrived in the harsh climate of Indonesia's Lesser Sunda Islands for millions of years, although amazingly, their existence was unknown to humans until about 100 years ago.

Reaching 10 feet (3 meters) in length and more than 300 pounds (136 kilograms), Komodo dragons are the heaviest lizards on Earth. They have long, flat heads with rounded snouts, scaly skin, bowed legs, and huge, muscular tails.

As the dominant predators on the handful of islands they inhabit, they will eat almost anything, including carrion, deer, pigs, smaller dragons, and even large water buffalo and humans. When hunting, Komodo dragons rely on camouflage and patience, lying in wait for passing prey. When a victim ambles by, the dragon springs, using its powerful legs, sharp claws and serrated, shark-like teeth to eviscerate its prey.

Animals that escape the jaws of a Komodo will only feel lucky briefly. Dragon saliva teems with over 50 strains of bacteria, and within 24 hours, the stricken creature usually dies of blood poisoning. Dragons calmly follow an escapee for miles as the bacteria takes effect, using their keen sense of smell to hone in on the corpse. A dragon can eat a whopping 80 percent of its body weight in a single feeding.

There is a stable population of about 3,000 to 5,000 Komodo dragons on the islands of Komodo, Gila Motang, Rinca, and Flores. However, a dearth of egg-laying females, poaching, human encroachment, and natural disasters has driven the species to endangered status.

Komodo Dragon Range Fast Facts

Type: Reptile Diet: Carnivore Average life span in the wild: 30 years+ Size: 10 ft (3 m) Weight: 330 lbs (150 kg) Protection status: Endangered Did you know? Komodo dragons can run up to 11 mph (18 kph) in short bursts. Size relative to a 6-ft (2-m) man:

mountain lion
This powerful predator roams the Americas, where it is also known as a puma, cougar, and catamount. This big cat of many names is also found in many habitats, from Florida swamps to Canadian forests.

Mountain lions like to prey on deer, though they also eat smaller animals such as coyotes, porcupines, and raccoons. They usually hunt at night or during the gloaming hours of dawn and dusk. These cats employ a blend of stealth and power, stalking their prey until an opportunity arrives to pounce, then going for the back of the neck with a fatal bite. They will hide large carcasses and feed on them for several days.

Mountain lions once roamed nearly all of the United States. They were prized by hunters and despised by farmers and ranchers who suffered livestock losses at their hands. Subsequently, by the dawn of the 20th century, mountain lions were eliminated from nearly all of their range in the Midwest and Eastern U.S.—though the endangered Florida panther survives.

Today, whitetail deer populations have rebounded over much of the mountain lion's former range and a few animals have appeared in more eastern states such as Missouri and Arkansas. Some biologists believe that these big cats could eventually recolonize much of their Midwest and Eastern range—if humans allow them to do so. In most western U.S. states and Canadian provinces, populations are considered sustainable enough to allow managed sport hunting.

Mountain lions require a lot of room—only a few cats can survive in a 30-square-mile (78-square-kilometer) range. They are solitary and shy animals, seldom seen by humans. While they do occasionally attack people—usually children or solitary adults—statistics show that, on average, there are only four attacks and one human fatality each year in all of the U.S. and Canada.

Type: Mammal Diet: Carnivore Size: Head and body, 3.25 to 5.25 ft (1 to 1.6 m); Tail, 23.5 to 33.5 in (60 to 85 cm) Weight: 136 lbs (62 kg) Protection status: Endangered Size relative to a 6-ft (2-m) man:

red fox
Red foxes live around the world in many diverse habitats including forests, grasslands, mountains, and deserts. They also adapt well to human environments such as farms, suburban areas, and even large communities. The red fox's resourcefulness has earned it a legendary reputation for intelligence and cunning.

Red foxes are solitary hunters who feed on rodents, rabbits, birds, and other small game—but their diet can be as flexible as their home habitat. Foxes will eat fruit and vegetables, fish, frogs, and even worms. If living among humans, foxes will opportunistically dine on garbage and pet food.

Like a cat's, the fox's thick tail aids its balance, but it has other uses as well. A fox uses its tail (or "brush") as a warm cover in cold weather and as a signal flag to communicate with other foxes.

Foxes also signal each other by making scent posts—urinating on trees or rocks to announce their presence.

In winter, foxes meet to mate. The vixen (female) typically gives birth to a litter of 2 to 12 pups. At birth, red foxes are actually brown or gray. A new red coat usually grows in by the end of the first month, but some red foxes are golden, reddish-brown, silver, or even black. Both parents care for their young through the summer before they are able to strike out on their own in the fall.

Red foxes are hunted for sport, though not extensively, and are sometimes killed as destructive pests or frequent carriers of rabies.

Type: Mammal Diet: Omnivore Average life span in the wild: 2 to 4 years Size: Head and body, 18 to 33.75 in (46 to 86 cm); Tail, 12 to 21.75 in (30.5 to 55.5 cm) Weight: 6.5 to 24 lbs (3 to 11 kg) Size relative to a 6-ft (2-m) man:

It seems unfairly menacing that a snake that can literally "stand up" and look a full-grown person in the eye would also be among the most venomous on the planet, but that describes the famous king cobra.

King cobras can reach 18 feet (5.5 meters) in length, making them the longest of all venomous snakes. When confronted, they can raise up to one-third of their bodies straight off the ground and still move forward to attack. They will also flare out their iconic hoods and emit a bone-chilling hiss that sounds almost like a growling dog.

Their venom is not the most potent among venomous snakes, but the amount of neurotoxin they can deliver in a single bite—up to two-tenths of a fluid ounce (seven milliliters)—is enough to kill 20 people, or even an elephant. Fortunately, king cobras are shy and will avoid humans whenever possible, but they are fiercely aggressive when cornered.

King cobras live mainly in the rain forests and plains of India, southern China, and Southeast Asia, and their coloring can vary greatly from region to region. They are comfortable in the trees, on land, and in water, feeding mainly on other snakes, venomous and nonvenomous. They will also eat lizards, eggs, and small mammals.

They are the only snakes in the world that build nests for their eggs, which they guard ferociously until the hatchlings emerge.

King cobras may be best known as the species of choice for snake charmers of South Asia. Although cobras can hear, they are actually deaf to ambient noises, sensing ground vibrations instead. The charmer's flute entices the cobra by its shape and movement, not by the music it emits.

Type: Reptile Diet: Carnivore Average life span in the wild: 20 years Size: 13 ft (4 m) Weight: Up to 20 lbs (9 kg) Group name: Quiver Did you know? Synthetic cobra venom is used in pain relievers and arthritis medication. Size relative to a 6-ft (2-m) man:

baboon
There are five different species of baboons. All of them live in Africa or Arabia. Baboons are some of the world's largest monkeys, and males of different species average from 33 to 82 pounds (15 to 37 kilograms). Baboon bodies are 20 to 40 inches (60 to 102 centimeters) long, not including substantial tails of varying lengths.

Baboons generally prefer savanna and other semi-arid habitats, though a few live in tropical forests.

Like other Old World monkeys, baboons do not have prehensile (gripping) tails. But they can and do climb trees to sleep, eat, or look out for trouble. They spend much of their time on the ground.

Baboons are opportunistic eaters and, fond of crops, become destructive pests to many African farmers. They eat fruits, grasses, seeds, bark, and roots, but also have a taste for meat. They eat birds, rodents, and even the young of larger mammals, such as antelopes and sheep.

Four baboon species (i.e., chacma, olive, yellow, and Guinea) are known as the savanna baboons. These animals form large troops, composed of dozens or even hundreds of baboons, governed by a complex hierarchy that fascinates scientists. Males use shows of physical power to dominate rivals, and troop members spend endless hours carefully grooming one another to remove insects and dead skin.

A fifth species, the hamadryas baboon, lives in the hills along the Red Sea coasts of Africa and Arabia. These cliff-dwelling baboons disperse to forage during the day and reconvene in much smaller groups at night.

Type: Mammal Diet: Omnivore Average life span in the wild: 30 years Size: Head and body, 20 to 34 in (60 to 86 cm); Tail, 16 to 23 in (41 to 58 cm) Weight: 33 to 82 lbs (22 to 37 kg) Group name: Troop Did you know? Baboons use at least ten different and unique vocalizations to communicate with other members of the troop. Size relative to a 6-ft (2-m) man

king cobra
It seems unfairly menacing that a snake that can literally "stand up" and look a full-grown person in the eye would also be among the most venomous on the planet, but that describes the famous king cobra.

King cobras can reach 18 feet (5.5 meters) in length, making them the longest of all venomous snakes. When confronted, they can raise up to one-third of their bodies straight off the ground and still move forward to attack. They will also flare out their iconic hoods and emit a bone-chilling hiss that sounds almost like a growling dog.

Their venom is not the most potent among venomous snakes, but the amount of neurotoxin they can deliver in a single bite—up to two-tenths of a fluid ounce (seven milliliters)—is enough to kill 20 people, or even an elephant. Fortunately, king cobras are shy and will avoid humans whenever possible, but they are fiercely aggressive when cornered.

King cobras live mainly in the rain forests and plains of India, southern China, and Southeast Asia, and their coloring can vary greatly from region to region. They are comfortable in the trees, on land, and in water, feeding mainly on other snakes, venomous and nonvenomous. They will also eat lizards, eggs, and small mammals.

They are the only snakes in the world that build nests for their eggs, which they guard ferociously until the hatchlings emerge.

King cobras may be best known as the species of choice for the snake charmers of South Asia. Although cobras can hear, they are actually deaf to ambient noises, sensing ground vibrations instead. The charmer's flute entices the cobra by its shape and movement, not by the music it emits.

Type: Reptile Diet: Carnivore Average life span in the wild: 20 years Size: 13 ft (4 m) Weight: Up to 20 lbs (9 kg) Group name: Quiver Did you know? Synthetic cobra venom is used in pain relievers and arthritis medication. Size relative to a 6-ft (2-m) man:

alligotar gar
The prehistoric relatives of this megafish inhabited many parts of the world, but today gars live only in North and Central America.

Of the seven known gar species, the alligator is the largest, reaching up to ten feet (three meters) long and tipping the scales at up to 300 pounds (140 kilograms). These menacing-looking behemoths are generally olive green or yellow and have a heavily scaled body. A tooth-filled mouth and wide, alligator-like snout give the species its name.

These freshwater giants may look fierce, but attacks against people are unknown. They can pose a passive danger, though—the fish's eggs are poisonous to humans if ingested.

Adult gars have few natural predators, although alligators have been known to attack them. Young are preyed upon by larger fish. Alligator gars prey on fish, but they are opportunistic and have been known to feed on everything from waterfowl and small turtles to carrion.

Alligator gars are found throughout much of the coastal U.S. Southeast. They inhabit waters as far west as Texas and Oklahoma, as far north as the Mississippi River Basin and the lower Ohio and Missouri river systems, and southern drainages well into Mexico.

Gars inhabit lakes, bayous, and bays and are able to tolerate brackish and even salt water. But these toothy giants prefer large, slow-moving rivers, particularly those with wide floodplains, where shallow waters provide hatchlings with some protection from predators.

Unfortunately for the alligator gar, flood-control measures such as dams and dikes have dramatically altered their riverine ecosystems and largely eliminated their preferred spawning habitats across North America. These breeding challenges have contributed to significant population declines across much of the animal's range.

Alligator gars are also targeted by both commercial and sport fisheries and have frequently been overfished. They are now protected by law in parts of their range.

Type: Fish Diet: Carnivore Average life span in the wild: Females 50 years, males 26 years Size: Up to 10 ft (3 m) Weight: Up to 300 lbs (140 kg) Did you know? The alligator gar has become something of an Internet celebrity. Tales and photos of these enormous, fierce-looking fish are widely circulated—and sometimes dismissed as hoaxes. Size relative to a 6-ft (2-m) man:

wolverine
The wolverine is a powerful animal that resembles a small bear but is actually the largest member of the weasel family.

These tough animals are solitary, and they need a lot of room to roam. Individual wolverines may travel 15 miles (24 kilometers) in a day in search of food. Because of these habitat requirements, wolverines frequent remote boreal forests, taiga, and tundra in the northern latitudes of Europe, Asia, and North America.

Wolverines eat a bit of vegetarian fare, like plants and berries, in the summer season, but this does not make up a major part of their diet—they are tenacious predators with a taste for meat. Wolverines easily dispatch smaller prey, such as rabbits and rodents, but may even attack animals many times their size, such as caribou, if the prey appears to be weak or injured. These opportunistic eaters also feed on carrion—the corpses of larger mammals, such as elk, deer, and caribou. Such finds sustain them in winter when other prey may be thinner on the ground, though they have also been known to dig into burrows and eat hibernating mammals.

Males scent-mark their territories, but they share them with several females and are believed to be polygamous. Females den in the snow or under similar cover to give birth to two or three young each late winter or early spring. Kits sometimes live with their mother until they reach their own reproductive age—about two years old.

Wolverines sport heavy, attractive fur that once made them a prime trapper's target in North America. Their fur was used to line parkas, though this practice is far less common today and the animals are protected in many areas.

Fast Facts

Type: Mammal Diet: Omnivore Average life span in the wild: 7 to 12 years Size: Head and body, 26 to 34 in (66 to 86 cm); Tail, 7 to 10 in (18 to 25 cm) Weight: 24 to 40 lbs (11 to 18 kg) Size relative to a 6-ft (2-m) man:

tiger
Tigers are the largest members of the cat family and are renowned for their power and strength.

There were eight tiger subspecies at one time, but three became extinct during the 20th century. Over the last 100 years, hunting and forest destruction have reduced tiger populations from hundreds of thousands of animals to perhaps fewer than 2,500. Tigers are hunted as trophies, and also for body parts that are used in traditional Chinese medicine. All five remaining tiger subspecies are endangered, and many protection programs are in place.

Bengal tigers live in India and are sometimes called Indian tigers. They are the most common tiger and number about half of all wild tigers. Over many centuries they have become an important part of Indian tradition and lore.

Tigers live alone and aggressively scent-mark large territories to keep their rivals away. They are powerful nocturnal hunters that travel many miles to find buffalo, deer, wild pigs, and other large mammals. Tigers use their distinctive coats as camouflage (no two have exactly the same stripes). They lie in wait and creep close enough to attack their victims with a quick spring and a fatal pounce. A hungry tiger can eat as much as 60 pounds (27 kilograms) in one night, though they usually eat less.

Despite their fearsome reputation, most tigers avoid humans; however, a few do become dangerous maneaters. These animals are often sick and unable to hunt normally, or live in an area where their traditional prey has vanished.

Females give birth to litters of two to six cubs, which they raise with little or no help from the male. Cubs cannot hunt until they are 18 months old and remain with their mothers for two to three years, when they disperse to find their own territory.

Fast Facts

Type: Mammal Diet: Carnivore Average life span in the wild: 8 to 10 years Size: Head and body, 5 to 6 ft (1.5 to 1.8 m); tail, 2 to 3 ft (0.6 to 0.9 m) Weight: 240 to 500 lbs (109 to 227 kg) Protection status: Endangered Did you know? A tiger's roar can be heard as far as 2 mi (3 km) away. Size relative to a 8 feet (2.4) man:

hammer head shark
Hammerhead sharks are consummate predators that use their oddly shaped heads to improve their ability to find prey. Their wide-set eyes give them a better visual range than most other sharks. And by spreading their highly specialized sensory organs over their wide, mallet-shaped head, they can more thoroughly scan the ocean for food.

One group of sensory organs is the ampullae of Lorenzini, which allows sharks to detect, among other things, the electrical fields created by prey animals. The hammerhead's increased ampullae sensitivity allows it to find its favorite meal, stingrays, which usually bury themselves under the sand.

The great hammerhead is the largest of the nine identified species of this shark. It can grow up to 20 feet (6 meters) in length and weigh up to 1,000 pounds (450 kg), although smaller sizes are more common.

Found in temperate and tropical waters worldwide, far offshore and near shorelines, hammerheads are often seen in mass summer migrations seeking cooler water. They are gray-brown to olive-green on top with off-white undersides, and they have heavily serrated, triangular teeth. Their extra-tall, pointed dorsal fins are easily identifiable.

Most hammerhead species are fairly small and are considered harmless to humans. However, the great hammerhead's enormous size and fierceness make it potentially dangerous, though few attacks have been recorded.

Hammerhead populations are not accurately known, but appear stable worldwide, and they are not considered threatened.

Fast Facts

Type: Fish Diet: Carnivore Average life span in the wild: 20 to 30 years Size: 13 to 20 ft (4 to 6 m) Weight: 500 to 1,000 lbs (230 to 450 kg) Group name: School or shoal Did you know? Hammerheads use their wide heads to attack stingrays, pinning the winged fish against the sea floor. Size relative to a 6-ft (2-m) man

saltwater crocodile
The Nile crocodile has a somewhat deserved reputation as a vicious man-eater. The proximity of much of its habitat to people means run-ins are frequent. And its virtually indiscriminate diet means a villager washing clothes by a riverbank might look just as tasty as a migrating wildebeest. Firm numbers are sketchy, but estimates are that up to 200 people may die each year in the jaws of a Nile croc.

Africa's largest crocodilian, these primordial brutes reach a maximum size of about 20 feet (6 meters) and can weigh up to 1,650 pounds (730 kilograms). Average sizes, though, are more in the range of 16 feet (5 meters) and 500 pounds (225 kilograms). They live throughout sub-Saharan Africa, the Nile Basin, and Madagascar in rivers, freshwater marshes, and mangrove swamps.

The diet of the Nile crocodile is mainly fish, but it will attack almost anything unfortunate enough to cross its path, including zebras, small hippos, porcupines, birds, and other crocodiles. It will also scavenge carrion, and can eat up to half its body weight at a feeding.

One unusual characteristic of this fearsome predator is its caring nature as a parent. Where most reptiles lay their eggs and move on, mother and father Nile crocs ferociously guard their nests until the eggs hatch, and they will often roll the eggs gently in their mouths to help hatching babies emerge.

Hunted close to extinction in the 1940s through the 1960s, local and international protections have helped them rebound in most areas. In some regions, though, pollution, hunting, and habitat loss have severely depleted their numbers.

Fast Facts

Type: Reptile Diet: Carnivore Average life span in the wild: 45 years (est.) Size: 16 ft (5 m) Weight: 500 lbs (225 kg) Group name: Bask (on land) or float (in water) Did you know? Mummified crocodiles and crocodile eggs have been discovered in Egyptian tombs.

electric eel
Despite their serpentine appearance, electric eels are not actually eels. Their scientific classification is closer to carp and catfish.

These famous freshwater predators get their name from the enormous electrical charge they can generate to stun prey and dissuade predators. Their bodies contain electric organs with about 6,000 specialized cells called electrocytes that store power like tiny batteries. When threatened or attacking prey, these cells will discharge simultaneously, emitting a burst of at least 600 volts, five times the power of a standard U.S. wall socket.

They live in the murky streams and ponds of the Amazon and Orinoco basins of South America, feeding mainly on fish, but also amphibians and even birds and small mammals. As air-breathers, they must come to the surface frequently. They also have poor eyesight, but can emit a low-level charge, less than 10 volts, which they use like radar to navigate and locate prey.

Electric eels can reach huge proportions, exceeding 8 feet (2.5 meters) in length and 44 pounds (20 kilograms) in weight. They have long, cylindrical bodies and flattened heads and are generally dark green or grayish on top with yellowish coloring underneath.

Human deaths from electric eels are extremely rare. However, multiple shocks can cause respiratory or heart failure, and people have been known to drown in shallow water after a stunning jolt.

Electric eels are extremely common throughout their range.

wolfs
Wolves are legendary because of their spine-tingling howl, which they use to communicate. A lone wolf howls to attract the attention of his pack, while communal howls may send territorial messages from one pack to another. Some howls are confrontational. Much like barking domestic dogs, wolves may simply begin howling because a nearby wolf has already begun.

Wolves are the largest members of the dog family. Adaptable gray wolves are by far the most common and were once found all over the Northern Hemisphere. But wolves and humans have a long adversarial history. Though they almost never attack humans, wolves are considered one of the animal world's most fearsome natural villains. They do attack domestic animals, and countless wolves have been shot, trapped, and poisoned because of this tendency.

In the lower 48 states, gray wolves were hunted to near extinction, though some populations survived and others have since been reintroduced. Few gray wolves survive in Europe, though many live in Alaska, Canada, and Asia.

Red wolves live in the southeastern United States, where they are endangered. These animals actually became extinct in the wild in 1980. Scientists established a breeding program with a small number of captive red wolves and have reintroduced the animal to North Carolina. Today, perhaps 100 red wolves survive in the wild.

The maned wolf, a distant relative of the more familiar gray and red wolves, lives in South America. Physically, this animal resembles a large, red fox more than its wolf relatives.

Wolves live and hunt in packs of around six to ten animals. They are known to roam large distances, perhaps 12 miles (20 kilometers) in a single day. These social animals cooperate on their preferred prey—large animals such as deer, elk, and moose. When they are successful, wolves do not eat in moderation. A single animal can consume 20 pounds (9 kilograms) of meat at a sitting. Wolves also eat smaller mammals, birds, fish, lizards, snakes, and fruit.

Wolfpacks are established according to a strict hierarchy, with a dominant male at the top and his mate not far behind. Usually this male and female are the only animals of the pack to breed. All of a pack's adults help to care for young pups by bringing them food and watching them while others hunt.

Fast Facts

Type: Mammal Diet: Carnivore Average life span in the wild: 6 to 8 years Size: Head and body, 36 to 63 in (91 to 160 cm); Tail, 13 to 20 in (33 to 51 cm) Weight: 40 to 175 lbs (18 to 79 kg) Group name: Pack Protection status: Endangered

leopard seal
The leopard seal is named for its black-spotted coat. The pattern is similar to that of the famous big cat, though the seal's coat is gray rather than golden in color. This seal is sometimes called the sea leopard, and the resemblance is more than skin deep. Like their feline namesakes, leopard seals are fierce predators. They are the most formidable hunters of all the seals and the only ones that feed on warm-blooded prey, such as other seals. Leopard seals use their powerful jaws and long teeth to kill smaller seals, fish, and squid.

These effective predators live in frigid Antarctic and sub-Antarctic waters, where they also eat penguins. They often wait underwater near an ice shelf and snare the birds just as they enter the water after jumping off the ice. They may also come up beneath seabirds resting on the water surface and snatch them in their jaws.

Shellfish are a far less dramatic prey but still an important part of the leopard seal's diet.

Leopard seals are earless seals. They have long bodies (10 to 11.5 feet/3 to 3.5 meters) and elongated heads. Like most other seals, leopard seals are insulated from frigid waters by a thick layer of fat known as blubber.

Though the leopard seal is known for its coat, it has not been commercially hunted for its skin like its fur seal relatives.

Fast Facts

Type: Mammal Diet: Carnivore Average life span in the wild: 12 to 15 years Size: 10 to 11.5 ft (3 to 3.5 m) Weight: Up to 840 lbs (380 kg)

sea otter
This aquatic member of the weasel family is found along the coasts of the Pacific Ocean in North America and Asia. The sea otter spends most of its time in the water but, in some locations, comes ashore to sleep or rest. Sea otters have webbed feet, water-repellent fur to keep them dry and warm, and nostrils and ears that close in the water.

Sea otters often float at the water's surface, lying on their backs in a posture of serene repose. They sleep this way, often gathered in groups. Otters sometimes float in forests of kelp, or giant seaweed, in which they entangle themselves to provide anchorage in the swirling sea.

These aquatic otters do more than sleep while floating on their backs. They are often seen with a clam or mussel and a rock that has been deftly snared from the ocean floor. Otters will place the rock on their chests, and repeatedly smash the shellfish against it until it breaks open to reveal the tasty meal inside. They also dine on such aquatic creatures as sea urchins, crabs, squid, octopuses, and fish.

Sea otters are the only otters to give birth in the water. Mothers nurture their young while floating on their backs. They hold infants on their chests to nurse them, and quickly teach them to swim and hunt.

Sea otters are meticulously clean. After eating, they wash themselves in the ocean, cleaning their coat with their teeth and paws. They have good reason to take care of their coats—it helps them to remain waterproof and insulated against the cold. Sea otters have thick underfur that traps air to form an insulating layer against the chilly waters (they have no insulating fat). This coat is invaluable to otters, but it has worth to some humans as well.

Sea otters were hunted for their fur to the point of near extinction. Early in the 20th century only 1,000 to 2,000 animals remained. Today, 100,000 to 150,000 sea otters are protected by law.

Fast Facts

Type: Mammal Diet: Carnivore Average life span in the wild: Up to 23 years Size: 4 ft (1.25 m) Weight: 65 lbs (30 kg) Protection status: Threatened

nudibranch
The bottom-dwelling, jelly-bodied nudibranch (NEW-dih-bronk) might seem an unlikely canvas for Mother Nature to express her wildest indulgences of color and form. But these shell-less mollusks, part of the sea slug family, bear some of the most fascinating shapes, sumptuous hues, and intricate patterns of any animal on Earth.

There are more than 3,000 known species of nudibranch, and new ones are being identified almost daily. They are found throughout the world's oceans, but are most abundant in shallow, tropical waters. Their scientific name, Nudibranchia, means naked gills, and describes the feathery gills and horns that most wear on their backs.

Generally oblong in shape, nudibranchs can be thick or flattened, long or short, ornately colored or drab to match their surroundings. They can grow as small as 0.25 inches (6 millimeters) or as large as 12 inches (31 centimeters) long.

They are carnivores that slowly ply their range grazing on algae, sponges, anemones, corals, barnacles, and even other nudibranchs. To identify prey, they have two highly sensitive tentacles, called rhinophores, located on top of their heads. Nudibranchs derive their coloring from the food they eat, which helps in camouflage, and some even retain the foul-tasting poisons of their prey and secrete them as a defense against predators.

Nudibranchs are simultaneous hermaphrodites, and can mate with any other mature member of their species. Their lifespan varies widely, with some living less than a month, and others living up to one year.

Fast Facts

Type: Invertebrate Diet: Carnivore Average life span in the wild: Up to 1 year Size: 0.25 to 12 in (6 mm to 31 cm) Weight: Up to 3.3 lbs (1.5 kg) Did you know? Some nudibranchs are solar-powered, storing algae in their outer tissues and living off the sugars produced by the algae’s photosynthesis. Size relative to a tea cup:

polar bear
Polar bears roam the Arctic ice sheets and swim in that region's coastal waters. They are very

strong swimmers, and their large front paws, which they use to paddle, are slightly webbed. Some polar bears have been seen swimming hundreds of miles from land—though they probably cover most of that distance by floating on sheets of ice.

Polar bears live in one of the planet's coldest environments and depend on a thick coat of insulated fur, which covers a warming layer of fat. Fur even grows on the bottom of their paws, which protects against cold surfaces and provides a good grip on ice. The bear's stark white coat provides camouflage in surrounding snow and ice. But under their fur, polar bears have black skin—the better to soak in the sun's warming rays.

These powerful predators typically prey on seals. In search of this quarry they frequent areas of shifting, cracking ice where seals may surface to breathe air. They also stalk ice edges and breathing holes. If the opportunity presents itself, polar bears will also consume carcasses, such as those of dead whales. These Arctic giants are the masters of their environment and have no natural enemies.

Females den by digging into deep snow drifts, which provide protection and insulation from the Arctic elements. They give birth in winter, usually to twins. Young cubs live with their mothers for some 28 months to learn the survival skills of the far north. Females aggressively protect their young, but receive no help from their solitary male mates. In fact, male polar bears may even kill young of their species.

Polar bears are attractive and appealing, but they are powerful predators that do not typically fear humans, which can make them dangerous. Near human settlements, they often acquire a taste for garbage, bringing bears and humans into perilous proximity.

Fast Facts

Type: Mammal Diet: Carnivore Average life span in the wild: 25 to 30 years Size: Head and body, 7.25 to 8 ft (2.2 to 2.5 m); Tail, 3 to 5 in (7.5 to 12.5 cm) Weight: 900 to 1,600 lbs (410 to 720 kg) Size relative to a 6-ft (2-m) man:

dingo
The dingo is legendary as Australia's wild dog, though it also occurs in Southeast Asia. The Australian animals may be descendents of Asian dingoes that were introduced to the continent some 3,000 to 4,000 years ago.

These golden or reddish-colored canids may live alone (especially young males) or in packs of up to ten animals. They roam great distances and communicate with wolf-like howls.

Dingo hunting is opportunistic. Animals hunt alone or in cooperative packs. They pursue small game such as rabbits, rodents, birds, and lizards. These dogs will eat fruits and plants as well. They also scavenge from humans, particularly in their Asian range.

Dingoes breed only once a year. Females typically give birth to about five pups, which are not independent until six to eight months of age. In packs, a dominant breeding female will kill the offspring of other females.

Australia is home to so many of these animals that they are generally considered pests. A famous "dingo fence" has been erected to protect grazing lands for the continent's herds of sheep. It is likely that more dingoes live in Australia today than when Europeans first arrived.

Though dingoes are numerous, their pure genetic strain is gradually being compromised. They can and do interbreed with domestic dogs to produce hybrid animals. Studies suggest that more than a third of southeastern Australia's dingoes are hybrids.

Fast Facts

Type: Mammal Diet: Carnivore Size: Head and body, 3.5 to 4 ft (1.1 to 1.2 m); Tail, 12 to 13 in (30 to 33 cm) Weight: 22 to 33 lbs (10 to 15 kg) Group name: Pack

asian lion
Nearly all wild lions live in sub-Saharan Africa, but one small population of Asian lions exists in India's Gir Forest. Asian lions and African lions are subspecies of the same species.

Asian lions once prowled from the Middle East to India. Now, only 200 to 260 of these magnificent animals survive in the wild. The Gir Forest's dry teak woods were once a royal hunting ground. Today they are a reserve where the endangered Asian lions are heavily protected. An additional 200 Asian lions live in zoos.

Lions are the only cats that live in groups, called prides. Prides are family units that may include up to three males, a dozen or so females, and their young. All of a pride's lionesses are related and female cubs typically stay with the group as they age. Young males eventually leave and may establish their own prides by taking over a group headed by another male.

Only male lions boast manes, the impressive fringe of long hair that encircles their heads. Males defend the pride's territory. They mark the area with urine, roar menacingly to warn intruders, and chase off animals that encroach on their turf.

Female lions are the pride's primary hunters. They often work together to prey upon large mammals.

After the hunt, the group effort often degenerates to squabbling over the sharing of the kill, with cubs at the bottom of the pecking order. Young lions do not help the pride hunt until they are about a year old. Lions will hunt alone if the opportunity presents itself, and they also steal kills from hyenas or wild dogs.

Fast Facts

Type: Mammal Diet: Carnivore Average life span in the wild: 16 to 18 years Weight: 300 to 500 lbs (120 to 226 kg) Group name: Pride Protection status: Endangered Size relative to a 6-ft (2-m) man:

Jaguars are the largest of South America's big cats. They once roamed from the southern tip of that continent north to the region surrounding the U.S.-Mexico border. Today significant numbers of jaguars are found only in remote regions of South and Central America—particularly in the Amazon basin.

These beautiful and powerful beasts were prominent in ancient Native American cultures. In some traditions the Jaguar God of the Night was the formidable lord of the underworld. The name jaguar is derived from the Native American word yaguar, which means "he who kills with one leap."

Unlike many other cats, jaguars do not avoid water; in fact, they are quite good swimmers. Rivers provide prey in the form of fish, turtles, or caimans—small, alligatorlike animals. Jaguars also eat larger animals such as deer, peccaries, capybaras, and tapirs. They sometimes climb trees to prepare an ambush, killing their prey with one powerful bite.

Most jaguars are tan or orange with distinctive black spots, dubbed "rosettes" because they are shaped like roses. Some jaguars are so dark they appear to be spotless, though their markings can be seen on closer inspection.

Jaguars live alone and define territories of many square miles by marking with their waste or clawing trees.

Females have litters of one to four cubs, which are blind and helpless at birth. The mother stays with them and defends them fiercely from any animal that may approach—even their own father. Young jaguars learn to hunt Fast Facts Type: Mammal Diet: Carnivore Average life span in the wild: 12 to 15 years Size: Head and body, 5 to 6 ft (1.5 to 1.8 m); tail, 27.5 to 36 in (70 to 91 cm) Weight: 100 to 250 lbs (45 to 113 kg) Protection status: Near Threatened Size relative to a 6-ft (2-m) man:by living with their mothers for two years or more.

Jaguars are still hunted for their attractive fur. Ranchers also kill them because the cats sometimes prey upon their livestock.

golden eagle
This powerful eagle is North America's largest bird of prey and the national bird of Mexico. These birds are dark brown, with lighter golden-brown plumage on their heads and necks. They are extremely swift, and can dive upon their quarry at speeds of more than 150 miles (241 kilometers) per hour.

Golden eagles use their speed and sharp talons to snatch up rabbits, marmots, and ground squirrels. They also eat carrion, reptiles, birds, fish, and smaller fare such as large insects. They have even been known to attack full grown deer. Ranchers once killed many of these birds for fear that they would prey on their livestock, but studies showed that the animal's impact was minimal. Today, golden eagles are protected by law.

Golden eagle pairs maintain territories that may be as large as 60 square miles (155 square kilometers). They are monogamous and may remain with their mate for several years or possibly for life. Golden eagles nest in high places including cliffs, trees, or human structures such as telephone poles. They build huge nests to which they may return for several breeding years. Females lay from one to four eggs, and both parents incubate them for 40 to 45 days. Typically, one or two young survive to fledge in about three months.

These majestic birds range from Mexico through much of western North America as far north as Alaska; they also appear in the east but are uncommon. Golden eagles are also found in Asia, northern Africa, and Europe.

Some golden eagles migrate, but others do not—depending on the conditions of their geographic location. Alaskan and Canadian eagles typically fly south in the fall, for example, while birds that live in the western continental U.S. tend to remain in their ranges year-round.

Fast Facts

Type: Bird Diet: Carnivore Average life span in the wild: 30 years Size: 33 to 38 in (84 to 97 cm); Wingspan, 6 to 7.5 ft (1.8 to 2.3 m) Weight: 6 to 15 lbs (3 to 7 kg)

sea horse
Seahorses are truly unique, and not just because of their unusual equine shape. Unlike most other fish, they are monogamous and mate for life. Rarer still, they are among the only animal species on Earth in which the male bears the unborn young.

Found in shallow tropical and temperate waters throughout the world, these upright-swimming relatives of the pipefish can range in size from 0.6 inches (1.5 centimeters) to 14 inches (35 centimeters) long.

Male seahorses are equipped with a brood pouch on their ventral, or front-facing, side. When mating, the female deposits her eggs into his pouch, and the male fertilizes them internally. He carries the eggs in his pouch until they hatch, then releases fully formed, miniature seahorses into the water.

Because of their body shape, seahorses are rather inept swimmers and can easily die of exhaustion when caught in storm-roiled seas. They propel themselves by using a small fin on their back that flutters up to 35 times per second. Even smaller pectoral fins located near the back of the head are used for steering.

They anchor themselves with their prehensile tails to sea grasses and corals, using their elongated snouts to suck in plankton and small crustaceans that drift by. Voracious eaters, they graze continually and can consume 3,000 or more brine shrimp per day.

Population data for most of the world’s 35 seahorse species is sparse. However, worldwide coastal habitat depletion, pollution, and rampant harvesting, mainly for use in Asian traditional medicine, have made several species vulnerable to extinction.

Fast Facts

Type: Fish Diet: Carnivore Average life span in the wild: 1 to 5 years (estimated) Size: 0.6 to 14 in (1.5 to 35 cm) Group name: Herd Did you know? Seahorses have no teeth and no stomach. Food passes through their digestive systems so quickly, they must eat almost constantly to stay alive. Size relative to a tea cup:

brown bears
The awe-inspiring brown bear lives in the forests and mountains of northern North America, Europe, and Asia. It is the most widely distributed bear in the world.

These omnivorous giants tend to be solitary animals, except for females and their cubs, but at times they do congregate. Dramatic gatherings can be seen at prime Alaskan fishing spots when the salmon swim upstream for summer spawning. In this season dozens of bears may gather to feast on the fish, craving fats that will sustain them through the long winter ahead. In fall a brown bear may eat as much as 90 pounds (40 kilograms) of food each day, and it may weigh twice as much before hibernation as it will in spring.

Brown bears dig dens for winter hibernation, often holing up in a suitable hillside. Females, or she-bears, den while pregnant and give birth during this winter rest, usually to a pair of cubs. Brown bear cubs nurse on their mother's milk until spring and stay with her for some two and a half years—so females only reproduce once every three years.

Adult brown bears are powerful, top-of-the-food chain predators, but much of their diet consists of nuts, berries, fruit, leaves and roots. Bears also eat other animals, from rodents to moose.

The world's largest brown bears are found in coastal British Columbia and Alaska, and on islands such as Kodiak.

Despite their enormous size, brown bears are extremely fast, having been clocked at speeds of 30 miles per hour (48 kilometers per hour). They can be dangerous to humans, particularly if surprised or if a person gets between a mother bear and her cubs.

Fast Facts

Type: Mammal Diet: Omnivore Average life span in the wild: 25 years Size: 5 to 8 ft (1.5 to 2.5 m) Weight: 700 lbs (318 kg) Group name: Sloth or sleuth Size relative to a 6-ft (2-m) man:

african lion
Lions are the only cats that live in groups, which are called prides. Prides are family units that may include up to three males, a dozen or so females, and their young. All of a pride's lionesses are related, and female cubs typically stay with the group as they age. Young males eventually leave and establish their own prides by taking over a group headed by another male.

Only male lions boast manes, the impressive fringe of long hair that encircles their heads. Males defend the pride's territory, which may include some 100 square miles (259 square kilometers) of grasslands, scrub, or open woodlands. These intimidating animals mark the area with urine, roar menacingly to warn intruders, and chase off animals that encroach on their turf.

Female lions are the pride's primary hunters. They often work together to prey upon antelopes, zebras, wildebeest, and other large animals of the open grasslands. Many of these animals are faster than lions, so teamwork pays off.

After the hunt, the group effort often degenerates to squabbling over the sharing of the kill, with cubs at the bottom of the pecking order. Young lions do not help to hunt until they are about a year old. Lions will hunt alone if the opportunity presents itself, and they also steal kills from hyenas or wild dogs.

Lions have been celebrated throughout history for their courage and strength. They once roamed most of Africa and parts of Asia and Europe. Today they are found only in parts of sub-Saharan Africa, except for one very small population of Asian lions that survives in India's Gir Forest.

Fast Facts

Type: Mammal Diet: Carnivore Size: Head and body, 4.5 to 6.5 ft (1.4 to 2 m); Tail, 26.25 to 39.5 in (67 to 100 cm) Weight: 265 to 420 lbs (120 to 191 kg) Group name: Pride Protection status: Vulnerable Size relative to a 6-ft (2-m) man:

siberian tigers
Siberian (or Amur) tigers are the world's largest cats. They live primarily in eastern Russia's birch forests, though some exist in China and North Korea. There are an estimated 400 to 500 Siberian tigers living in the wild, and recent studies suggest that these numbers are stable. Though their northern climate is far harsher than those of other tigers, these animals have some advantages. Northern forests offer the lowest human density of any tiger habitat, and the most complete ecosystem. The vast woodlands also allow tigers far more room to roam, as Russia's timber industry is currently less extensive than that of many other countries.

Tigers are the largest of all wild cats and are renowned for their power and strength. There were once eight tiger subspecies, but three became extinct during the 20th century. Over the last hundred years, hunting and forest destruction have reduced overall tiger populations from hundreds of thousands to perhaps 3,000 to 5,000. Tigers are hunted as trophies and also for body parts that are used in traditional Chinese medicine. All five remaining tiger subspecies are endangered, and many protection programs are in place. Poaching is a reduced—but still very significant—threat to Siberian tigers.

Tigers live alone and aggressively scent-mark large territories to keep their rivals away. They are powerful hunters that travel many miles to find prey, such as elk and wild boar, on nocturnal hunts. Tigers use their distinctive coats as camouflage (no two have exactly the same stripes) and hunt by stealth. They lie in wait and creep close enough to attack their victims with a quick spring and a fatal pounce. A hungry tiger can eat as much as 60 pounds (27 kilograms) in one night, though they usually eat less.

Despite their fearsome reputation, most tigers avoid humans; however, a few do become dangerous maneaters. These animals are often sick and unable to hunt normally, or live in areas where their traditional prey has vanished.

Females give birth to litters of two to six cubs, which they raise with little or no help from the male. Cubs cannot hunt until they are 18 months old, and remain with their mothers for two to three years, when they disperse to find their own territory.

Fast Facts

Type: Mammal Diet: Carnivore Size: 10.75 ft (3.3 m) Weight: 660 lbs (300 kg) Protection status: Endangered Size relative to a 6-ft (2-m) man: