A small bone found 30 years ago at Dinosaur Cove could revolutionize our understanding of echidnas and platypuses' evolution.

A controversial idea suggests the ancestors of echidnas were more like the platypus. For the first time, fossil evidence ...

As the world's only surviving egg-laying mammals, Australasia's platypus and four echidna species are among the most extraordinary animals on Earth. They are also very different from each other.

An analysis of a 100-million-year-old fossil has found that the creature it belonged to, similar to a monotreme like the echidna and platypus, was water-dwelling. The study supports the theory ...

We may have gotten the evolutionary origins of the echidna backward, as new research suggests its ancestors probably lived in ...

Australia's burrowing echidna evolved from a water-dwelling ancestor in an "extremely rare" biological event, scientists said Tuesday in a new study of the peculiar egg-laying mammals. With ...