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Temporal range: Lower Cretaceous
Psittacosaurus mongoliensis skeleton.JPG
Scientific classification
Kingdom: Animalia
Class: Sauropsida
Superorder: Dinosauria
Order: Ornithischia
Suborder: Cerapoda
Infraorder: Ceratopsia
Family: Psittacosauridae
Genus: Psittacosaurus
Osborn, 1923

Psittacosaurus was a small ceratopsian dinosaur from the Lower Cretaceous of what is now Asia, about 130 to 100 million years ago. It was more basal than other members of the Ceratopsia: it was bipedal, and had no horns or frill on its head. What made it a ceratopsian was its beak.

It is notable for being the most species-rich dinosaur genus, but there is no general agreement on these species. Nine to eleven species are named for fossils found in different regions of China, Mongolia and Russia, with a possible additional species from Thailand.

All species of Psittacosaurus were gazelle-sized bipedal herbivores with a high, powerful beak on the upper jaw. At least one species had long, quill-like structures on its tail and lower back, possibly with a display function. Psittacosaurs were early ceratopsians. They developed adaptations of their own, but they also shared features with later ceratopsians, such as Protoceratops and the elephant-sized Triceratops.