Period: The Mosasaurs lived in the Cretaceous period about 65 million years ago.

Habitat: Mosasaurs were adapted to living in shallow seas.

Diet: These dinosaurs were carnivores, they hunted and ate fish, turtles, mollusks' and shellfish.

Size: The Mosasaurs grew to 26 feet long to 33 feet long.

Description: These dinosaurs were powerful swimmers and had long, streamlined bodies. The long head had very pointed, powerful jaws with many sharp teeth. Mosasaurs had four short, paddle-like limbs adapted to life in the water. A long tail, perhaps finned, completed its serpentine body.