More than 500 million years ago, during what is known as the Cambrian period, the seas and oceans on Earth were filled with a ...

Scientists once assumed that evolution would eventually force every member of a species to behave in more or less the same ...

Embryonic germ layers are the fundamental organizing principle in animal development. They provide the structural basis from which tissues and organs arise. During early embryogenesis, cells divide to ...

Kangaroos thrive on tough grass using thick enamel instead of complex teeth, revealing an unexpected path in evolution.

For decades, scientists have sought to explain the so-called "Cambrian Explosion," a pivotal period over 500 million years ...

Life around the ocean surface can appear strangely similar from a distance. A dorsal fin cuts through the water, a dark body rises briefly to breathe,.

Why do we kiss? The answer involves ancient apes, immune systems and a neurochemical cocktail in the human brain that few can ...

“Platypuses are extremely rare in the fossil record and are often restricted to teeth, so it’s exciting to find new material ...

A new interdisciplinary review published in The Quarterly Review of Biology argues that red meat, once an essential component ...

The bird retina is one of the most energetically expensive tissues in the animal kingdom, yet it doesn’t use the energy ...