An artist’s impression depicts Kryoryctes at Dinosaur Cove in Australia. New research supports the hypothesis that Kryoryctes is a common ancestor of both the platypus and echidna. - Peter Schouten ...

WASHINGTON, July 18 (Reuters) - A shrew-like primitive mammal that inhabited China 165 million years ago represents a milestone in mammalian evolution, scientists said on Thursday, boasting a key ...

Which group of mammals has the more 'primitive' reproductive strategy -- marsupials, with their short gestation periods, or humans and other placental mammals, which have long gestation periods? For ...

At a time when the vast majority of mammals were the size of shrews and mice, Vintana sertichi was a super heavyweight. Researchers have unearthed the skull of a primitive mammal with remarkably keen ...

A newly identified primitive mammal-like animal was agile, sleek and had a voracious appetite for meat. The animal, identified as a varanopid pelycosaur and part of the genus Aerosaurus, looked like ...

Above: Artist's depiction of three new species of fossil condylarths: From left to right, Conacodon hettingeri, Miniconus jeanninae and Beornus honeyi. (Credit: Banana Art Studio) Paleontologists at ...

Primitive air-breathing fish, whose direct ancestors first appeared around 400 million years ago, show mechanisms controlling the heart which were previously considered to be found only in mammals -- ...

The most primitive bat ever found fluttered around about 52 million years ago, but lacked a key feature seen in most bats — the ability to echolocate, hunting and navigating using a kind of sonar. A ...

Sign up for CNN’s Wonder Theory science newsletter. Explore the universe with news on fascinating discoveries, scientific advancements and more. The story of two of ...