User blog:StaraptorEmpoleon/What is a dinosaur?

What is a dinosaur?
Dinosaurs are "upright limbed, open hip socketed and grasping handed ornithodirans (dinosaurs, pterosaurs and their closest relatives), and is composed of the most recent common ancestor of Iguanadon and Megalosaurus and all of its descendants ."



Dinosaur ancestors
Dinosaurs evolved from Dromomeron and Lagerpeton and eventually evolved into animals such as Marasuchus and then, dinosaurs.



What are some examples of dinosaurs?
There are two main branches of dinosaurs:
 * The Ornithischians, which became extinct;
 * The Saurischians, which are survived by birds