MICHAEL LONG / SCIENCE PHOTO LIBRARY MICHAEL LONG / SCIENCE PHOTO LIBRARY
Protungulatum and Trogosus jaw bones, illustration. Lateral view (bottom) of the lower jaw bone (mandible) of the extinct prehistoric mammal Protungulatum that dates from the Late Cretaceous. At top is a mandible from a specimen of Trogosus. Trogosus, a large bear-like tilodont, was a prehistoric mammal with rodent-like teeth and clawed feet. It was found in what is now Wyoming, USA, during the Middle Eocene.
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