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

Despite not looking much like one another, many do however closely resemble other species of animals that they are not ...

This mammal, about the size of an opossum, had a mix of strange characteristics that haven't been seen together before. It highlights evolutionary strangeness that can arise when evolution occurs in ...

Echidnas, also called spiny anteaters, are some of the weirdest mammals in the world. They're among the only mammals that don't give birth to live babies, and they also carry their young in a pouch.

Researchers have uncovered the fossil of an early mammal named the "crazy beast" that lived 66 million years ago alongside dinosaurs and giant crocodiles on Madagascar, and it's unlike any mammal ever ...