Psittacosaurus

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? Psittacosaurus Fossil range: Early Cretaceous
Scientific classification
Kingdom: Animalia Phylum: Chordata Class: Sauropsida Superorder: Dinosauria Order: Ornithischia Suborder: Marginocephalia Infraorder: Ceratopsia Family: Psittacosauridae Genus: Psittacosaurus Osborn, 1923
Species
P. mongoliensis (type)      Osborn, 1923 P. sinensis      Young, 1958 P. meileyingensis      Sereno et al., 1988 P. xinjiangensis      Sereno & Zhao, 1988 ?P. sattayaraki      Buffetaut & Suteethorn, 1992 P. neimongoliensis      Russell & Zhao, 1996 P. ordosensis      Russell & Zhao, 1996 P. mazongshanensis      Xu, 1997 ?P. sibiricus      Voronkevich, 1998 P. lujiatunensis      Zhou et al., 2006
Synonyms
Protiguanodon  Osborn, 1923

Psittacosaurus was a small ceratopsian dinosaur from the Early Cretaceous. Unlike other ceratopsians it had no horns or no frill. What made it a ceratopsian was its beak.