Scientists have debated whether the evolution of teeth occurred outside-in or inside-out. Sawfish fossils may hold the answer.

Chimpanzees eat more than fruit. When they're on the hunt for meat, researchers have found their barks bring other chimps to close in on their prey.

Researchers have found three species of plant that evolved to have similar leaf types. It points to evolution being predictable, not entirely random.

Some moths use ultrasound to warn bats they contain bitter toxins; others are just trying to sound like they'd taste bad, too.

Research shows that coral reefs' diversity of fish results from a relatively recent innovation among bony fish: biting prey from surfaces.

Scientists have viewed marsupial reproduction as more "primitive" than that of placental mammals. Fossils complicate that view.

"...reproduction can sometimes actually be the leading reason for many of the adaptations that animals have for dealing with their local climate."

Most mammals have large bodies and short limbs to stay warm. But bats are an exceptiopn to the rule. A new model explains why their nonconformity works.

The long human lifespan is due in part to the contributions of our elders, according to a new theory in the debate about life post-fertility.

A new study suggests fresh directions for exploring the hypothesis that viruses were essential to the evolution of complex life, including humans.