Dinosaurs lived on Earth about 70 million years ago.
There were many different types of dinosaurs. Some dinosaurs were very large and some were very small.
Some dinosaurs could fly.
Some dinosaurs could swim.
Nobody really knows what colour dinosaurs were.
Scientists believe that crocodiles are actually dinosaurs.
Scientists are not sure why the dinosaurs died out. One popular theory is that a giant meteor hit Earth causing many natural disasters that killed all the dinosaurs.