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 ...

The echidna — fittingly known as the spiny anteater — lives entirely on land ... which Hand said it may have inherited from a swimming ancestor that used its hind legs as rudders.