These are other animals, besides mammals, that lived during the Paleocene epoch of the Cenozoic.  The birds took the opportunity to become some of the largest predators on land.  Most of the reptiles looked like they do today, but a few were left over from the days of the dinosaurs.  Orders of animals such as Younginiformes and Choristoderans survived the Cretaceous-Paleogene extinction and continued to flourish until the Eocene period when a cooling climate killed off the ancient reptiles.

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