Ornithopod

Ornithopod Temporal range: Lower Jurassic – Upper Cretaceous
Iguanodon, a type of ornithopod
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Class:	Sauropsida
Superorder:	Dinosauria
Order:	Ornithischia
Suborder:	Cerapoda
Infraorder:	Ornithopoda Marsh, 1881

Ornithopoda is a clade of ornithischian dinosaurs, called ornithopods, that started out as small, bipedal running grazers and grew in size and numbers until they became one of the most successful groups of herbivores in the Cretaceous world, dominating the North American land.