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

With an estimated 8.75 million living species on earth, there are always going to be some weird and unusual animals you've never heard of. From the friendly-faced axolotl who's one of the most ...

These spiny or slimy ocean creatures display an astonishing diversity of appearances, behaviors and lifestyles—and many are ...

(CNN) — The story of two of the strangest animals on the planet just got a little stranger, thanks to clues revealed by a lone fossil specimen that scientists now say represents a long-extinct ...

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 ...