Several animals can and do prey on humans. To reassure readers and promote conservation efforts, many sources state that these animals only do so when they are hungry and there is nothing else available, but this isn't always the case. Animals that have been reported to attack humans for food include three of the four big cats (lion, tiger, and leopard; jaguars are not known to eat people, but will attack them if disturbed), the American Black Bear, the polar bear (world's largest land predator), wolves (especially the Grey Wolf), jackals, large crocodiles and alligators (especially the saltwater and Nile crocodile), large sharks (especially the great white shark, tiger shark, and bull shark), and the Komodo dragon.
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The most lethal predators of humans are tigers and saltwater crocodiles. The Champawat tiger, a female Bengal tiger shot in 1907, was responsible for over 400 documented deaths in Nepal and India before she was shot by Jim Corbett. One saltwater crocodile, Gustave, a 20 foot (6 meter) Nile crocodile living in Burundi, Africa, has been rumored to have killed over 300 people. Although this figure is exaggerated, the crocodile has probably killed at least 100.