Few organizations can rival the National Park Service when it comes ... joke out of White Sands alleged that giant sloths, formally called Harlan’s ground sloth, ran amok within the park.

Bustos at White Sands National Monument in Holloman Air Force Base, NM, and colleagues was titled, "Footprints preserve terminal Pleistocene hunt? Human-sloth interactions in North America." ...

For a long time, scientists believed the first humans to arrive in the Americas soon killed off these giant ground sloths ...