Temporal range: Upper Palaeocene to Upper Miocene, 58–8 million years ago
The first creodont fossils were in the later Palaeocene, ~58 million years ago (mya), and the last 8 mya.
Creodonts show various adaptations to their carnivorous life-style, and show convergent evolution with modern carnivores. They share, for example, the carnassial shear, a modification of teeth that sliced meat like scissors.
The Carnivora also developed larger brains and more efficient running. Once forest and woodland was partly replaced by grassland, in the Miocene, the true carnivores had the advantage, and the creodonts lost ground and eventually became extinct.