These large mammal-like reptiles lived during the ... With the extinction of the Dimetrodon, a new species of prehistoric reptile ruled the Earth during the late Permian and early Triassic periods.

The researchers focused on bone articular fragments from therian mammals, a group that includes modern marsupials and ...

More mammals were living on the ground several million years before the mass extinction event that wiped out the dinosaurs, new research has revealed.

The teeth of horses and zebras look alike. The ear bones of mammals were once the jaws of prehistoric reptiles. And so on. Despite these differences, all mammals share four traits that are shown ...

Thescelosaurus has been at the heart of a prehistoric controversy ... is a four-chambered heart more like those of mammals or birds than those of reptiles. Such a heart would help support the ...

This small reptile, found during a 2013 expedition, features mammal-like teeth and rectangular ... exploration and adds to our understanding of prehistoric life on the ancient supercontinent ...

Chunks of sandstone were chipped away as they searched for prehistoric clues ... but instead to a small reptile called a crocodyliform, according to a Feb. 18 study published in the peer-reviewed ...

Our brief introduction to dinosaurs reveals a key feature that gave them an advantage over other prehistoric reptiles. Dinosaurs are a group of reptiles that dominated the land for over 140 million ...