Presence of four-chambered heart is common in crocodile and all mammals.
- A crocodile is a large amphibious reptile.
- All reptiles possess a three-chambered heart except crocodile.
- It lives mostly in large tropical rivers, where it is an ambush predator.
- Like alligators, crocodiles are part of the order Crocodylia, which is a group of reptile that includes birds and long-extinct dinosaurs.
- Crocodiles release heat through their mouths rather than through sweat glands.