Throughout the series, a number of nameless background dinosaurs; conjecturally "Valleydwellers"; are present in scenes taking place in the Great Valley. They are usually inconsequential to the plots of the films and episodes they appear in; though four of them (a Lambeosaurus, a Corythosaurus, a Maiasaura and an Ankylosaurus) serve as the secondary antagonists of The Amazing Threehorn Girl.
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