A new study suggests the platypus and echidna — the only egg-laying mammals — had a water-dwelling ancestor. The finding ...

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

As the world's only surviving egg-laying mammals, Australasia's platypus and four echidna species are among the most ...

The sequencing of the platypus genome has received a high amount of misleading press attention. What does this information really tell us about this strangely unique animal and its genetic past?