Mississippi has changed over millions of years and everything from sea monster to dire wolf fossils can be found here.

Imagine standing on a muddy riverbank 50 million years ago and seeing a strange creature lumbering by—part crocodile, part ...

Learn what secrets this pregnant ichthyosaur reveals from the Early Cretaceous and why this find is so important.

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

A previously unknown shark once swam around the shores of the U.K. more than 70 million years ago. The new species, named ...

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

The creatures cruised the world’s oceans with features we often associate with marine mammals, such as coats of blubber and ...

From dog-like ancestors that roamed the shores to the fully aquatic cetaceans we know today, the fossil record of whale evolution stands as one of the most complete and compelling examples of ...

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 ancestor.