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But something else convinced the Tsavo lions that humans were fair game, Patterson said.

To unravel the century-old mystery, the study authors examined evidence of the lions' behavior preserved in their teeth. Microscopic wear patterns can tell scientists about an animal's eating habits — particularly during the last weeks of life — and the Tsavo lions' teeth didn't show signs of the wear and tear associated with crunching big, heavy bones, the scientists wrote in the study.

Hypotheses proposed in the past suggested that the lions developed a taste for people through scavenging, perhaps because their usual prey had died off from drought or disease. But if the lions were hunting humans out of desperation, the starving cats would have certainly cracked human bones to get the last bit of nutrition from their grisly meals, Patterson said. And wear patterns on the teeth showed that they left the bones alone, so the Tsavo lions probably weren't motivated by a lack of more suitable prey, he added.

A more likely explanation is that the ominously named The Ghost and The Darkness began hunting humans because infirmities in their mouths hindered their ability to catch bigger and stronger animals, the study authors wrote.

Down in the mouth
Previous findings, first presented to the American Society of Mammologists in 2000, according to New Scientist, documented that one of the Tsavo lions was missing three lower incisors, and had a broken canine and a sizable abscess in the tissues surrounding another tooth's root. The second lion also had damage in its mouth, with a fractured upper tooth showing exposed pulp. [The 10 Deadliest Animals on Earth]

For the first lion in particular, pressure on the abscess would have caused unbearable pain, providing more than enough motivation for the animal to skip large, powerful prey and go after punier people, Patterson said. In fact, chemical analysis conducted in another, earlier study, published in 2009 in the journal Proceedings of the National Academy of Sciences, showed that the lion with the abscess consumed more human prey than its partner. Moreover, after the first lion was shot and killed in 1898 — more than two weeks before the second lion was gunned down — the attacks on people ceased, Patterson noted.

Nearly 120 years after the man-eaters' lives abruptly ended, fascination with their gruesome habits persists. But had it not been for their preserved remains — which John Patterson sold to FMNH as trophy rugs in 1924 — today's explanations for their habits would be no more than speculation, Bruce Patterson told Live Science.

"There would be no way to resolve these questions if it weren't for specimens," he said. "After almost 120 years, we can tell not only what these lions were eating, but we can resolve differences between these lions by interrogating their skins and skulls.

"There's a lot of science you can build on that, all derived from specimens," Patterson added. "I have 230,000 other specimens in the museum collection, and they all have stories to tell."""