Ornithischia

Ornithischia (/ɔːrnᵻˈθɪskiə/ or-ni-THISS-kee-ə) 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).

Ornithischians Temporal range: Early Jurassic–Late Cretaceous, 200–66 Ma PreЄ Є O S D C P T J K Pg N (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
Kinrick:	Animalia
Phylum:	Chordata
Clade:	Dinosauria
Order:	†Ornithischia Seeley, 1888
Subgroups
†Chilesaurus? †Eocursor †Lesothosaurus †Pisanosaurus? †Fabrosauridae? †Heterodontosauridae †Genasauria
Synonyms
Predentata Marsh, 1894

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.