Read a National Geographic magazine article about the rise of mammals, and get information, facts, and more about the evolution of mammals.

Mammals, including humans, stand out with their distinctively upright posture, a key trait that fueled their spectacular evolutionary success. Yet, the earliest known ancestors of modern mammals more ...

About 200 million years ago, furry, little egg-laying creatures evolved the ability to feed their offspring with a secretion from special glands: milk. Their evolutionary journey continued, and by ...

A small fossil from the windswept Gobi Desert is forcing scientists to rethink a long chapter in the story of mammal evolution. For decades, researchers believed a group of ancient mammals called ...