Ornithischia Archive

Iguanodon

Iguanodon were bulky herbivores that could shift from bipedality to quadrupedality. The only well-supported species, I. bernissartensis, is estimated to have weighed about 3 tonnes (3.5 tons) on
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Stegosaurus

The quadrupedal Stegosaurus is one of the most easily identifiable dinosaur genera, due to the distinctive double row of kite-shaped plates rising vertically along the rounded back and
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Pachycephalosaurus

The pachycephalosaurs Dracorex and Stygimoloch may be specimens of Pachycephalosaurus in which the dome and horns are not well-developed, either because the animal was a juvenile or a
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Parasaurolophus

The most noticeable feature was the cranial crest, which protruded from the rear of the head and was made up of the premaxilla and nasal bones. William Parks,
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Triceratops

The function of the frills and three distinctive facial horns has long inspired debate. Traditionally these have been viewed as defensive weapons against predators. More recent theories, noting
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