The Darke County ground sloth is the largest individual of the species Megalonyx jeffersoni found. To find out more about the 12,000 year old fossils from which the molds were made, read the article entitled “A ground sloth, Megalonyx, from a Pleistocene site in Darke Co., Ohio,” by Richard S. Mills, 1975, in Science (volume 75, # 3, pp 147-155).