Sloths weren’t always slow-moving, furry tree-dwellers. Their prehistoric ancestors were huge – up to 4 tons – and when startled, they brandished immense claws. For a long time, scientists believed ...

If you’ve seen any of the “Ice Age” animated Disney movies, we have some bad news: You don’t know the real ice age.

New data shows Ice Age hunters used Mezhyrich’s mammoth-bone shelters briefly, highlighting adaptations in a volatile, frigid ...

Scientists have confirmed that Nanotyrannus was a mature species, not a young T. rex. A microscopic look at its hyoid bone ...

Was Nanotyrannus a bona fide species or just a teenage Tyrannosaurus rex with a lot more growing to do? Scientists have settled that debate.

Discover the extraordinary prehistoric giants – from mega-sloths to monster sharks – that once made today’s animals look ...