Ornithischia (/ɔːrnˈθɪskiə/ or-ni-THISS-kee-ə)[2] or Predentata is an extinct order o beaked, 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).

Temporal range:
Early JurassicLate Cretaceous, 200–66 Ma
(Possible Late Triassic record)
Ornithischia Diversity.jpg
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

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


  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