Fossils show that howler monkey ancestors, Stirtonia victoriae, were eating leaves 13 million years ago, altering body size ...

Three tiny Purgatorius teeth found in Colorado are helping scientists trace how early primates evolved and spread across North America.

While you may not frequently visit humid environments, such as rainforests, the animal life in damp locations may look a bit ...

Sixty-six million years ago, a massive asteroid smashed into Earth. Life has undergone at least five mass extinctions in the ...

Thirteen million years ago, a group of medium-sized monkeys known for guarding their territory among the treetops with fearsome "howls" started doing something new. These monkeys, among the oldest ...

The natural and the social world shaped the evolution of each. Knowing whom to invite to dinner is as important as knowing ...

An extinct relative of the howler monkey may have been the first leaf-eating primate in South and Central America ...

Picture two ancient apes in a lush African forest, gently pressing their mouths together, not for romance, but as a primal ...

Why are stop lights red? The common explanation about red light traveling farther through fog is actually wrong. The real ...

• 13 million years ago, a medium-sized monkey known for guarding its territory among the treetops with a fearsome “howl” started doing something new. This monkey, one of the oldest known ancestors of ...

Most people know only two things about the appendix: You don’t need it – and if it bursts, you need surgery fast. That basic story traces back at least to Charles Darwin, the English naturalist who ...

A newborn cannot speak, read, or walk. Yet moments after entering the world, the infant brain already responds to rhythm and ...