Giant Sloth The giant ground sloth was one of the enormous creatures that thrived during the ice ages. Looking a little bit like an oversized hamster it probably fed on leaves found on the lower branches of trees or bushes. The largest of these ground sloths was Megatherium which grew to the size of a modern elephant. Like other giant creatures that disappeared at the end of the Pleistocene period (about 10,000 years ago), Megatherium, and its smaller sloth cousin, Mylodon, are extinct. Only the small tree sloth survives today. Or so scientists believe. In the 1890's an Argentinean explorer, geographer and adventurer, Ramon Lista, was hunting in a portion of his country known as Patagonia when a large, unknown creature covered with long hair, trotted past the party. To Lista the creature looked like a gigantic armadillo. The party shot at the beast, but the bullets seemed to have no effect. Professor Florentino Ameghino, a paleontologist in Argentina, heard the Lista story and began to wonder if the strange beast was a giant sloth that had survived from the Pleistocene. He might not have put much stock in the Lista story if it had not been for legends he'd collected from Indians in the Patagonia region about hunting such a large creature in ancient times. The animal in the Indian stories was nocturnal, and slept during the day in burrows it dug with it's claws. The Indians found it difficult to get their arrows to penetrate the animal's skin. Ameghino also had a piece of physical evidence. A small section of apparently fresh hide found by a rancher named Eberhardt on his property in a cave in 1895.The hide was studded with small, hard, calcium nodules and would have been impervious to the teeth of Pleistoncene predators. It seemed likely that it would have also resisted Indian arrows and Lista's bullets. So sure was Ameghino this was the creature Lista had seen he named the creature after Lista: Nemoylodon listai, or "Lista's new Mylodon." Expeditions to Eberhardt's and other caves, recovered additional pieces of hide along with evidence the Eberhardt's cave had been home to both men and Mylodon. With the development of the Carbon-14 dating method in the twentieth century the age of Mylodon remains in the Eberhardt's cave was settled. Dung found in the cave was more than 10,000 years old. The skin was estimated to be 5,000 years old. Conditions in the caves may have preserved it making it look fresh to the eye and fooling Ameghino. No additional evidence has turned up that the giant sloth survives today. -- 少吹冷气 少吃肉 少骑车 节省用电 请保护大自然.... Love on Nature, mother of all. 生态保育网页 http://www.ran.org/ http://www.savebiogems.org/ --

※ 发信站: 批踢踢实业坊(ptt.cc) ◆ From: 61.230.112.147