New discoveries from several archaeological sites in North and South America suggest that ancient people first arrived in the ...

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

Sloths were not always slow-moving, furry tree-dwellers. Their prehistoric ancestors were huge — up to four tonnes — and when ...

Keith Poulsen’s jaw dropped when farmers showed him images on their cellphones at the World Dairy Expo in Wisconsin in ...