World Book Trivia Quiz For Kids--3/5-dinosaurs

Scientists learn about dinosaurs by studying their fossils. These include dinosaur bones, teeth, eggs, nests, tracks, skin imprints, and waste products. Scientists also study living animals that are like dinosaurs in some way.

With its long horns, bony frill, and large size, Triceratops could protect itself well against meat-eating dinosaurs, such as Tyrannosaurus.

Tyrannosaurus was the largest meat-eating dinosaur. Tyrannosaurus is also known by its scientific name Tyrannosaurus rex or T. rex for short. Tyrannosaurus lived millions of years ago in what is now western North America.

All plesiosaurs had a round, stiff body and a tail. They had two pairs of flippers instead of arms and legs.

Its bony plates may have helped Stegosaurus warm up and cool down. It could warm up by turning the plates to the sun to soak up heat. It could cool down by letting air blow over the plates and cool the blood flowing through them.

Dinosaurs disappeared about 65 million years ago. No one really knows why, but scientists have several theories, or ideas.

Eoraptor was one of the first dinosaurs. It lived about 230 million years ago in what is now northwestern Argentina.

There are two kinds of true dinosaurs: (1) the ornithischians > and (2) the saurischians >. They are different mostly in the shape of their hips and other parts of their skeletons.

Diplodocus was a giant plant-eating dinosaur with a long neck and an even longer tail. It lived about 150 million years ago in what is now the Western United States.

The ancestors of the dinosaurs first appeared about 330 million years ago. These ancestors were small, lizardlike reptiles.