Around 10,000 years ago, in the region of the United States now known as the Appalachians, lived one of the most impressive mammals ever to inhabit North American. With a height of over 8 feet, and weighing up to 800 pounds, the giant ground sloth (
Megalonyx jeffersonii to scientists) was a formidable sight. However, the ground sloth, like most large land mammals in North America, went extinct. Why is still a mystery to scientists - some believe that it may have been the result of a change in climate, others suggest that it may have been from predation by humans.