Scientists and historians have long debated what makes us human. Why is our species, Homo sapiens, so different compared to our extinct cousins? Anthropologists point to our physiological adaptations ...

Footprints made by Paranthropus boisei and Homo erectus Discovery raises questions about interspecies competition Tracks reveal differing foot anatomy and locomotion Nov 28 (Reuters) - About 1.5 ...

Imagine a world where colossal creatures roamed the land, coexisting with early humans. This was the reality in the Americas, where giant sloths and mastodons thrived alongside our ancestors for ...

Human activity may be triggering the greatest extinction event since the asteroid impact that wiped out the dinosaurs, ...

SAO PAULO, Brazil (AP) — Sloths weren’t always slow-moving, furry tree-dwellers. Their prehistoric ancestors were huge — up to 4 tons (3.6 metric tons) — and when startled, they brandished immense ...