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→Evolutionary claims
==Evolutionary claims==
==Evolutionary claims==
[[File:Cerotopsiansfig037a.jpg|left|200px|thumb|comparison of ''Triceratops'' and ''Torosaurus'' skulls.]]
Paleontologists once believed there were several species of Triceratops, judging from the large number of [[fossil]] remains, but it is now thought that there were just two, ''T. horridus'' and the larger ''T. prorsus''; the remaining eight animals considered as subspecies or dubious due to being incomplete. According to evolution, they are descended from ''Psittacosaurus'', a small bipedal ornithopod whose remains were found in central Asia, and from there the ceratopsian line migrated to North America. ''Triceratops'' has been considered the last of the line, existing just before the end of the [[Cretaceous]] period.<ref>''The Complete Book of Dinosaurs'', by Dougal Dixon, Anness Publishing, 2006</ref>
Paleontologists once believed there were several species of Triceratops, judging from the large number of [[fossil]] remains, but it is now thought that there were just two, ''T. horridus'' and the larger ''T. prorsus''; the remaining eight animals considered as subspecies or dubious due to being incomplete. According to evolution, they are descended from ''Psittacosaurus'', a small bipedal ornithopod whose remains were found in central Asia, and from there the ceratopsian line migrated to North America. ''Triceratops'' has been considered the last of the line, existing just before the end of the [[Cretaceous]] period.<ref>''The Complete Book of Dinosaurs'', by Dougal Dixon, Anness Publishing, 2006</ref>