The scientists on the team, who are from the Fukui Prefectural Dinosaur Museum in Katsuyama, the Ono City Board of Education and elsewhere, also said a fossil of a mammal-like reptile has been ...

A new study of modern reptiles will improve our ability to identify the diets of ancient animals, including dinosaurs.

Scientists have discovered the oldest known saber-toothed predator, a 270-million-year-old gorgonopsian therapsid fossil.

Unlike reptiles ... of dinosaurs, there was an age of ancient mammal relatives. Most of those ancient mammal relatives looked really different from what we think of mammals looking like today ...

This animal, from before the age of the dinosaurs, was a dog-like creature that was related to the ancestors of mammals. The first true mammals evolved roughly 200 million years ago, during the ...

during the early days of the dinosaurs. But mammals are the last surviving members of an older group, called the therapsids. At first glance, many therapsids weren’t obviously mammal-like , but they ...

Before the time of the dinosaurs, a naked, warm-blooded egg-layer known as a gorgonopsian sipped water from Pangea's tropical floodplains amid herb-grazing reptiles off what's now Mallorca in the ...