Cold-adapted animals started to evolve 2.6 million years ago when the permanent ice at the poles became more prevalent. There followed a time when the continental ice sheets expanded and contracted ...

A new study has provided fresh insights into how animals such as the woolly mammoth, musk ox and arctic fox evolved to ...

At least one giant ground sloth has been positively identified, with other bones still being studied by paleontologists.

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

A new fossil and DNA analysis traces how dozens of sloth species responded to climate shifts and humans. Just two small tree-dwelling sloths remain today.

A routine construction project has turned into a remarkable paleontological discovery as crews working on the TX State ...