National Geographic : 2013 Apr
russian reneWal What would we do with mammoths if we could clone them? Biologist Sergey Zimov’s suggestion: Set them loose in Pleistocene Park, a refuge he established in northeastern Siberia in 1996. Zimov argues that mammoths and other large Ice Age herbivores sustained the Siberian steppe that sustained them: They ate the grass, but they also fertilized it and tilled the soil with their hooves. Horses, bison, and other introduced herbivores are already transforming the park’s moss-dominated tundra back into grassland a mammoth could call home.