They may seem to breathe underwater, but really they can only breathe when their nostrils are in the air. Their snouts are shaped so that they can be almost all underwater, but still breathe.

Crocodiles are reptiles, so they have scaly skin. But amphibians like salamanders don't have scales. Not only do they sometimes have gills, they can actually get oxygen through their skin. The drawback is that they dry out fast.

Crocodiles can also do with less oxygen than we can because they are "cold-blooded". This doesn't mean that they're actually cold; it means that they get their heat from the environment. We get some from our surroundings, but make a lot of our own heat. This means that our systems work a lot harder and need a lot more food and oxygen. Crocodiles have been around WAY longer than humans. What do you think made them so successful that they have stayed the same for so long?

All crocodilians have a similar body shape, with a head held horizontally in front of the body, four legs which project from the sides, heavy scales which function as armor, and a heavy muscular tail. Their front feet have five separate toes and their rear feet have four partially-webbed toes. Their eyes are on the top of their head, close together to allow for binocular vision (the field of vision of the two eyes intersects, to provide more accurate depth perception in front of the animal). The nostrils are crescent-shaped and valvular, and set at the end of the snout, which allows breathing even when the animal is almost entirely submerged.

Check out the following site where you can learn more about crocodiles.

crocodilia