Most of us are familiar with sloths, the bear-like animals that hang from trees, live life in the slow lane, take a month to ...

The larger sloths didn’t do much tree climbing, at risk of falling to their deaths. Instead, they survived by being ...

Explore how ancient sloths evolved in size, from small climbers to massive ground dwellers, shaped by shifting climates and ...

Scientists have analyzed ancient DNA and compared more than 400 fossils from 17 natural history museums to figure out how and why extinct sloths got so big. Most of us are familiar sloths, the ...

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

Afar is a hotspot with hot rock masses rising from deep within the mantle. It created volcanism and lifted the landscape in northeastern Africa. Hot rock masses then flowed further north beneath the ...

Most of these extinct sloths also didn’t live in trees, because they were too big. The largest sloths, in the genus Megatherium, were about the size of Asian bull elephants and weighed roughly ...

T. rex evolved in North America from Asian ancestors. Climate shifts and extinction events helped tyrannosaurids and ...

Bones that are thought to be more than 140,000 years old have been discovered buried in the sea off the Indonesian coast, hinting to a previously unknown population in South East Asia.

Archaeologists have recovered 140,000-year-old Homo erectus bones from an extinct human species on the ocean floor in ...