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Temporal range:
Early JurassicLate Cretaceous, 200–66 Ma
(Possible Late Triassic record)
A collection o ornithischian fossil skelets. Clockwise frae upper left: Heterodontosaurus tucki (a heterodontosaurid), Stegosaurus stenops (a platit stegosaur), Scolosaurus thronus (an airmoured ankylosaur), Edmontosaurus annectens (a duck-billed hadrosaur), Stegoceras validum (a thick-heidit pachycephalosaur), an Triceratops horridus (a horned ceratopsian).
Scientific classification e
Kinrick: Animalia
Phylum: Chordata
Clade: Dinosauria
Order: Ornithischia
Seeley, 1888

Ornithischia (/ɔːrnˈθɪskiə/ or-ni-THISS-kee-ə)[2] or Predentata is an extinct order o beakit, yerbivorous dinosaurs. The name ornithischia is derived frae the Greek ornitheos (ορνιθειος) meanin 'o a bird' an ischion (ισχιον) meanin 'hip joint'. Thay are kent as the 'bird-hipped' dinosaurs acause o thair bird-lik hip structur, even though birds actually belang tae the 'lizard-hipped' dinosaurs (the saurischians).

Some commonly kent Ornithischians include the hornit dinosaurs (ceratopsians), armored dinosaurs (stegosaurs an ankylosaurs), Iguanodon, an the "deuck-billed" dinosaurs (hadrosaurids). Bein herbivores that bytimes lived in herds, thay wur mair numerous nor the saurischians. Mony were prey ainmals for the theropods an wur uisually smawer nor the sauropods.


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  1. Ferigolo, J.; Langer, M. C. (2007). "A Late Triassic dinosauriform from south Brazil and the origin of the ornithischian predentary bone". Historical Biology. 19: 23–33. doi:10.1080/08912960600845767.
  2. OED