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

Australia's burrowing echidna evolved from a water-dwelling ancestor in an "extremely rare" biological event, scientists said ...

Recent findings indicate that dire wolves and gray wolves are distantly related, having diverged about 5.7 million years ago ...

After the demise of the dinosaurs following an asteroid strike 66 million years ago, mammals became Earth's dominant land ...