New Mexico's White Sands National Monument is a desolate place; sparse vegetation pokes up throughout its salt flats and white gypsum dunes. But the area wasn't always a barren landscape. At the end ...

More than 10,000 years ago, a band of hunter-gatherers chased a group of giant ground sloths along the shores of an ancient lake, and their footprints still preserve the story. West of the sparkling ...

Last April, Matthew Bennett was lying on a white salt flat in New Mexico, uncovering fossilized footprints that had been preserved in the white rock. The print belonged to a ground sloth—a bulky ...