A study reveals how seasonal brain shrinking helps some mammals survive winter, offering new insights into brain plasticity ...

The definition of a mammal is a warm-blooded vertebrate animal distinguished by the possession of hair or fur, the secretion of milk by females for nourishing their young, and the birth of live ...

According to a new study, the first louse to take up residence on a mammalian host likely started out as a parasite of birds. That host-jumping event tens of millions of years ago began the long ...

At first glance, this mammal looks like a horse gone terribly wrong. But, in reality, Chalicotherium is far from a botched ...

Illustration showing Repenomamus robustus as it attacks Psittacosaurus lujiatunensis moments before a volcanic debris flow buries them both, ca. 125 million years ago. (Michael Skrepnick via ...

Dolphins, whales and seals are highly social animals. Many live in groups, form long-term relationships, and repeatedly ...

Two brand-new species of early mammals from the Jurassic period have been discovered, revealing the secrets of how we got our ears. These new species are hoped to give paleontologists insight into how ...

An international team has reconstructed the genome organization of the earliest common ancestor of all mammals. The reconstructed ancestral genome could help in understanding the evolution of mammals ...