A well-preserved fossil of a 165-million-year-old mammal ancestor from China with hind limbs like a platypus and a broad, ...

A fossil discovery suggests that suckling emerged in a common ancestor of modern mammals that lived in the Jurassic period.

How are these unique sex chromosomes formed? "The sex of a somatic cell as highly differentiated as a neurone may be detected ...

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

Paleontologists are trying to dispel a myth about what life was like when dinosaurs roamed the Earth. The false narrative has wormed its way into books, lectures and even scientific papers about this ...

A beautifully preserved fossil from Mongolia’s Gobi Desert has solved a mystery that puzzled paleontologists for nearly 40 ...

A groundbreaking new research project has analyzed the evolution of the placental mammal skull using 3D scans of 322 specimens housed in more than 20 international museum collections, and crafted a ...

Humans seldom think of themselves as mammals. But we share a significant part of our identity with more than 5,500 mammalian species currently living on the planet. Features like giving birth to live ...