Reptiles are cold-blooded and scaly animals, the majority of which are predators. But since reptiles are so diverse, ranging from lizards and snakes to turtles and crocodiles, the threats to the survival of each species are likely to be equally varied. Crocodiles and turtles among most threatened Well over half (58%) of all crocodile species and 50% of all turtles are at risk of extinction, making them the most threatened among reptiles.