Prehistoric animals once roamed — and ruled — planet ... Though vastly different, they all died out in similar ways due to ...

With many varieties and sizes—they ranged from a millimeter to more than 2 feet (0.6 meters) in length—trilobites proved among the most successful and enduring of all prehistoric animals.

Deep inside a labyrinth cave in southwestern France, ancient humans who lived around 30,000 years ago carved horses, mammoths and rhinoceroses into the walls, a fabulous prehistoric menagerie that ...