During the Mesozoic Era, dinosaurs ruled the land.

But the oceans were home to many exciting animals, too. Some were weird, with googly eyes or super-long necks. Others had giant teeth. The smallest animals might fit in your hand, while others were as big as the screen at a movie theater!

Prognathodon

(prog-NATH-uh-don)

Trinacromerum

(try-NACK-roh-meh-rum)

Many prehistoric creatures were huge. But the biggest animal that ever lived is alive today: the blue whale.

Where can you find an ocean that isn’t wet?

On a map!