Estimated to weigh between 2,000 and 4,000 pounds and growing nearly ten feet tall, these sloths looked and behaved very ...

Today, sloths are slow-moving, tree-dwelling creatures that live in Central and South America and can grow up to 2.5 feet ...

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

The large yellow-footed tortoise, Chelonoidis denticulata (vulnerable), from South America and the Caribbean ... Just in the past decade, two mammal species have gone extinct: a bat known as ...

After 128 years of exploration and fossil excavation, researchers have finally unearthed the skull of Genyornis newtoni.

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

The dire wolf went extinct around 10,000 years ago ... including plains and mountainous areas of North America and arid areas of South America. Fossils have been found in the asphalt pits at ...

Dire wolves went extinct roughly 13,000 years ago. Their skeletal remains have been found in North and South America ... what we know about the prehistoric species: Along with saber-toothed ...

I think the ethical issue here was the impropriety of humans making these animals extinct in the first place - Michael Archer Black headed ferrets are one of North America's most endangered ...