Before the Spanish introduced modern horses to the New World, horses roamed wild in North America, then they disappeared, but ...

The extinct mammals were about five times larger than a grizzly bear–and filled caves with their poop.

Massive Megatherium sloths once stood as large as Asian elephants, ripping foliage off treetops with prehensile tongues like ...

Given their abundance in American backyards, gardens and highway corridors these days, it may be surprising to learn that ...

Molecular clues from collagen in old bones are teaching us about the lives, movements, and demise of Ice Age megafauna like ...