Crocs have a keen sense of smell. The nostrils close when the croc is underwater.

Crocs have excellent hearing. Ear flaps close when the croc dives underwater.

Cone-shaped teeth hold the prey. To feed, the croc must tear off bite-sized chunks or swallow the prey whole.

When the croc loses a tooth, another one grows in its place.

Crocs can see underwater almost as well as on land. 'See-through' eyelids protect their eyes underwater.

Crocs can also see very well at night.

A 3.5m crocodile has brain the same size as a walnut! However crocs have very good senses for finding prey and they learn quickly.

The long crocodile jaw is designed for grabbing prey. The jaw can open and shut but not move from side to side.

Very powerful muscles snap the jaw closed when it grabs prey. The muscles that open the jaw are not as strong. Croc teeth are special too..

The croc's scaly skin is waterproof. For extra protection, the croc has bony scales and ridges along its back.

The bumps along the tail are not bony. Instead they have lots of blood vessels which collect warmth from the sun.

Both feet have claws but the back feet are webbed.

To swim, the croc swings its powerful tail from side to side. Its legs are held against the body.