According to a new study, the first louse to take up residence on a mammalian host likely started out as a parasite of birds. That host-jumping event tens of millions of years ago began the long ...

A new study reveals the surprisingly convergent evolution in the inner ear of mammals. An international research team showed that a group of highly divergent mammals known as Afrotheria and distantly ...

Monotremes are mammals that lay eggs and do not carry their young in a womb. They include species like the platypus and echidnas. Egg-laying monotremes may have retained certain traits from their ...

Imagine an animal that seems to be assembled from various other creatures: it has large eyes, the round body of a rabbit, a rodent’s pointed snout, tiny pig-like hooves, and even fangs like those of a ...

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 ...

Illustration showing Repenomamus robustus as it attacks Psittacosaurus lujiatunensis moments before a volcanic debris flow buries them both, ca. 125 million years ago. (Michael Skrepnick via ...