Dinosaur (English name: Dinosaur), refers to the most recent common ancestor of Triceratops, modern birds and Diplodocus and all its descendants. [1] 
For the convenience of research, dinosaurs can be divided into birds and non-avian dinosaurs. Among them, non-avian dinosaurs lived only in the Mesozoic (Triassic, Jurassic and Cretaceous), and were all extinct 65 million years ago. This entry focuses on non-avian dinosaurs. [1] 
Strong limbs, long tails and large bodies are some of the portrayals of non-avian dinosaurs. They mainly inhabit wooded or open areas on lakeshore plains (or coastal plains).
In 1841, when British scientist Richard Owen studied several fossils that looked like lizards, he believed that they were left by some prehistoric animals and named them dinosaurs, which means "terrifying lizards