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Repenomamus is a genus of mammal that live during the Early Cretceous in China. This mammal is different from what we think as it eat baby dinosaurs, such as Psittacosaurus as evidenced by a fossil.

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Jurassic World Dinosaur Field Guide

Repenomamus is mentioned in the Jurassic World Dinosaur Field Guide as an enemy to the Psittacosaurus. This is likely a reference to the fossil in which a baby Psittacosaurus was found in a Repenomamus.