Land O' Dinosaurs BillyBear4Kids. Man found the bones in the earth.
Scientist have tests they can do to see how old the bones of a dinosaur are.
They lived millions of years ago. No one really knows the answers to these questions. Some say that their habitats changed making it hard for them to find food. It is important to help our animals live so they do not become extinct like the dinosaurs did. The tuatara has virtually remained the same for over 140 million years.