All crocodiles are tropical species that, unlike alligators, are very sensitive to cold. They separated from other crocodilians during the Eocene epoch, about 55 million years ago. Many species are at the risk of extinction, some being classified as critically endangered.
Crocodiles are the largest reptiles. They are also the largest of all predators that spend some time on land. The biggest crocodiles are bigger than the biggest tigers and lions and polar bears. In the water only Great White sharks and Killer Whales are bigger predators..
A big crocodile, according to National Geographic writer Rick Gore, "is cunning enough to stalk a human, strong enough to bring down and dismember a water buffalo, yet gentle enough to crack open its own eggs to release its young." Dr. Daphne Soares, a neuroscientist at the University of Maryland, told the New York Times, “I absolutely love these creatures. They're beautiful, elegant and goofy at the same time..."An alligator looks like nothing so much as a big, amphibious and grievously misunderstood kitten. Sure, it sports thick scales and bulging bony knobs called osteoderms rather than fur, and 80 teeth to the house cat's 30, and a tail."
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