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Threehorn is the Land Before Time term for Triceratops, it is the type of dinosaur that Cera's dad Topps is as well as Cera, Tria, Tricia, Dinah and Dana. They are so named due to their having three horns, a small one just behind their nose and two above their eyebrows that point forward and slightly to the sides. This name possibly applies to other three-horned ceratopsians as well such as Chasmosaurus, Pentaceratops, and Torosaurus but this has not been confirmed.

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