Stegosauruses were briefly mentioned in Book 1: Keeper of the Lost Cities, when Elwin commented on Sophie holding Ella during her first appointment there. He stated that he has a stuffed stegosaurus named Stinky the Stegosaurus that he can't sleep without. It was later mentioned that a stegosaurus at Havenfield was stung by a manticore. Stegosauruses are likely covered in brightly colored feathers like other dinosaurs.

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