Ground sloths achieved their greatest size during the last ice age—right before starting to disappear around 15,000 years ago.

During the Ice Age, massive woolly mammoths, cave bears, and dire wolves roamed icy landscapes. Saber-toothed cats hunted with precision, and the gigantic Megalania dominated prehistoric Australia ...

A cave in Norway preserved remains of 46 Ice Age species. The discovery shows how cold-adapted animals struggled with climate shifts. Researchers have discovered the remains of a large animal ...

The big picture suggests that since the emergence of the oldest known sloths—ground animals around the size of a Great Dane—the creatures evolved into and out of tree living a number of times.