Warm-bodied ties between mammals and birds more ancient than previously recognised

13 Dec 2021
Dimetrodon
An artist's impression of the likely-endothermic Dimetrodon grandis, an early synapsid that was around for about 20 million years from the early Permian, 295 million years ago. Credit: Max Bellomio

The evolutionary origin of endothermy (the ability to maintain a warm body and higher energy levels than reptiles), currently believed to have originated separately in birds and mammals, could have occurred nearly 300 million years ago.

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