How many people still remember when "elk overpopulation" on Yellowstone's Northern Range was considered a serious problem as wapiti grazing exacted severe impacts on park plants, aspen and other wood vegetation. In this photo by Jim Peaco with the National Park Service haggard-looking elk are fed hay on the outskirts of Gardiner, Montana. A quarter century after wolves were reintroduced to Yellowstone, lobos and elk appear to have reached a state of dynamic equilibrium with their numbers. This is what Monbiot has in mind with red deer and wolves in Scotland.