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

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

Grizzly bears, for example, are a subspecies of brown bear found in parts of North America. There are many different ...

From outwitting predators to raising a family, speed can boost a bird’s chances of survival. Learn about the fastest bird ...