Imagine a world where massive, shaggy giants wandered ancient forests, their claws tearing at trees and their bulk reshaping ...

Imagine a world where forests echoed with the slow, thunderous steps of creatures as large as small cars. Millions of years ...

They’re slow, they’re sleepy, and they’ve taken over the internet—but sloths are more than just cute animals hanging from ...

By Jeanne Timmons Ground sloths emerged in South America tens of million years ago, eventually ranging as far north as Canada. While their modern relatives dwell in trees and top out at the size ...

On Wednesday, the Santa Cruz Museum of Natural History announced that it's now in possession of a prehistoric left arm bone belonging to a Jefferson’s ground sloth (Megalonyx jeffersonii ...

Dire wolves — or really, wolves with traits like the extinct species — are back. But New York has plenty of its own ...

The ancient animals were megafauna hunters, ultimately disappearing with the last giant ground sloths and mastodons about 13,000 years ago. Yet last week, Time proclaimed their second coming with ...

Four of these were species of ground sloth, three of which unknown to science.. Sloths are notable for their low energy levels and slow, deliberate movements (hence their name). They are part of a ...

The extinct giant ground sloths were some of the only mammals that had digestive systems large enough to process the huge avocado seeds whole. They feasted on the fruit and then dispersed the ...