Dinosaurs are extinct prehistoric reptiles and members of a large family of reptiles. They lived in the Mesozoic era of earth history. Dinosaurs appeared in the middle and Late Triassic and flourished in Jurassic and Cretaceous, but suddenly disappeared all over the world at the end of Cretaceous. The history of dinosaurs the discovery of dinosaur fossils has a long history. Long before the mantels discovered the Iguanodon, Europeans knew that there were many strange and huge bone fossils buried underground.
Although dinosaur fossils have existed on the earth for tens of millions of years, it was not until the 19th century that people knew that such strange animals existed on the earth. Gideon & middot was the first to find dinosaur fossils; Mantel.
Dinosaurs refer to the recent common ancestors and all descendants of Triceratops, modern birds and Lianglong. For the convenience of research, dinosaurs can be divided into birds and non birds dinosaurs. （KongLongShiShenMe）