Dinosaurs ruled Earth for about 165 million years.

A Tyrannosaurus rex tooth was about the size of a banana, including the root.

Fact #11442 · Dinosaur

Stegosaurus had a brain about the size of a walnut.

Fact #11447 · Dinosaur

Birds are dinosaurs — every chicken alive today is a living dinosaur.

Fact #11445 · Dinosaur

The asteroid that killed the dinosaurs hit Earth at about 45,000 mph.

Fact #11450 · Dinosaur

Pterosaurs and plesiosaurs weren't actually dinosaurs.

Fact #11449 · Dinosaur

Dinosaurs ruled Earth for about 165 million years.

Fact #11451 · Dinosaur

Some dinosaurs replaced their teeth every two weeks throughout life.

Fact #11448 · Dinosaur

Velociraptor was about the size of a turkey and almost certainly had feathers.

Fact #11443 · Dinosaur