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Herbivores with parrot-like beaks, bony frills and in many cases horns.
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Achelousaurus
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Albertaceratops
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Anchiceratops
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Archaeoceratops
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Arrhinoceratops
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Avaceratops
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Bagaceratops
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Centrosaurus
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Chaoyangsaurus
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Chasmosaurus
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Einiosaurus
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Graciliceratops
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Leptoceratops
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Liaoceratops
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Microceratus
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Micropachycephalosaurus
Micropachy-cephalosaurus
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Nedoceratops
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Pachyrhinosaurus
Pachyrhino-saurus
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Pentaceratops
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Protoceratops
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Psittacosaurus
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Stenopelix
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Styracosaurus
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Torosaurus
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Triceratops
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Udanoceratops
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Yinlong
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Zuniceratops