Reuters - Wed Aug 17, 2:29 PM ET
Scientists are proposing reintroducing large mammals such as elephants, lions, cheetahs and wild horses to North America to replace populations lost 13,000 years ago. The scientists say that not only could large tracts of North America act as breeding sanctuaries for species of large wild animals under threat in Africa and Asia, but that such ecological history parks could be major tourist attractions. 'Africa and parts of Asia are now the only places where megafauna are relatively intact, and the loss of many of these species within this century seems likely,' the team, led by Josh Donlan from New York's Cornell University, said. 'Given this risk of further extinction, re-wilding of North American sites carries global conservation implications,' the team wrote in Wednesday's issue of the science journal Nature. It said large mammals were common across all continents until the Late Pleistocene wipeout that hit North America hardest and handed the world to smaller species. The largest mammals in the United States today are bison. The Pleistocene epoch lasted from about 1.65 million years ago to 10,000 years ago. An elephant on the plains of Masai Mara Game Park in Kenya, August 18, 2003. (Antony Njuguna/Reuters)