dinousaurs

Dinosaurs Temporal range: Middle Triassic–Present, 231.4–0 Ma (range includes birds) Pre? ? O S D C P T J K Pg N
A collection of fossil dinosaur skeletons. Clockwise from top left: Microraptor gui (a winged theropod), Apatosaurus louisae (a giant sauropod), Stegosaurus stenops (a platedstegosaur), Triceratops horridus (a horned ceratopsian),Edmontosaurus regalis (a duck-billed ornithopod),Gastonia burgei (an armored ankylosaur).
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Class:	Reptilia
Clade:	Dinosauriformes
Clade:	Dinosauria Owen, 1842
Major groups
†Ornithischia †Stegosauria †Ankylosauria †Ornithopoda †Ceratopsia Saurischia †Sauropodomorpha Theropoda

Dinosaurs are a diverse group of animals of the clade Dinosauria. They first appeared during the Triassic period, approximately 230 million