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

Animals have evolved crab-like bodies at least five times throughout history, a process known as carcinization.

The next time you go wild swimming, whether in a lake, river or sea, you are probably sharing the water with one of your tiniest, yet closest relatives. Subscribe to our newsletter for the latest ...

Bioluminescence first evolved in animals at least 540 million years ago in a group of marine invertebrates called octocorals, according to the results of a new study. The study focuses on an ancient ...

Earth’s first sponges may have been ghostly, soft-bodied pioneers—ancient animals that evolved long before their skeletons ...