history of Dinosaur

Dinosaurs lived on earth about 230 million to 65 million years ago

In the period of earth history called Mesozoic (middle life) era Dinosaur lived on earth.  In Triassic, Jurassic and Cretaceous period they lived. Dinosaurs ate meat-theropods which mean best-food. They had sharp, hooked claws on their toes.

It is unknown exactly a dinosaur's lifespan was how long.  A few scientists called after their research that dinosaur's lived for as long as 200 years.

Dinosaur skulls had large hole.  Some of largest skulls were as a car.

Scientist speculate that there were 1, ooo different kind of non-avian dinosaurs and over 500 distinct group. they think that still uncovered dinosaur there may be many as 1850 group.

In all continents dinosaurs lived. Some of dinosaur were long tail. it help them to keep their balance when dinosaur running. All dinosaur laid eggs. About 40 kinds of dinosaur eggs have been discovered.

Scientist speculate that dinosaurs dominated Earth for over 145 million years.