Crocodiles are reptiles. There are twenty one species in the world. They live on land and water in the tropical area around the world. Most crocodiles grow to at least six meters in length. Their eyes are located on top of their heads so they can see above the surface of the water. They have tough skin and a powerful tail that allows them to move quickly in the water to catch prey. Crocodiles eat birds, fish, turtles and snakes. An adult crocodiles main enemy is humans.