The Origin and Early Evolution of Metatherian Mammals: The Cretaceous Record. Thomas E. Williamson, Stephen L. Brusatte and Gregory P. Wilson in ZooKeys, Article No. 465.

Mammals are best characterized by their warm blood, mammary glands and unique birth process. Birds are classified as avians, not mammals, notably, due to their egg birthing.

Plumage. An incredible world, for an incredible phenomenon. Say it with me now: plumage. Picture the colors, their variety and richness. Picture, while ...

Only mammals do, even though they weren’t the first tusked creatures. It is an ancient trait that predates dinosaurs, a new study has found.

In the book, "The Rise and Reign of the Mammals: A New History, from the Shadow of the Dinosaurs to Us," released on Tuesday (June 7) by Mariner Books, paleontologist Steve Brusatte answers these ...

First, no one is sure why we, or any other animal, dream. During the past century, however, scientists have made significant progress in understanding the factors that influence sleep and dreaming ...

The first mammals emerged during the reign of the dinosaurs, adopting a nocturnal lifestyle to stay safe. It was only until the dinosaurs were wiped off. Skip to content Gizmodo. Search .

Sixty-six million years ago, our ancestors lived through the most violent event in the Earth's history. How did small, insignificant mammals survive a doomsday asteroid?

All mammals have hair, but sometimes they've evolved to appear naked. Cetaceans are the largest group of hairless mammals, made up of animals including whales, dolphins, and porpoises. This makes ...

Some mammals may not experience vivid colorful dreams like humans do. Living in the water makes both sleeping and dreaming a challenge. First, no one is sure why we, or any other animal, dream.