The numbers of deer, because there was nothing to hunt them, had built up and built up in the Yellowstone Park, and despite efforts by humans to control them, they'd managed to reduce much of the vegetation there to almost nothing, they'd just grazed it away.
Var antallet af hjorte, fordi intet jagtede dem, forøget kraftigt i Yellowstone parken, og tiltrods for menneskers tiltag for at kontrollerer dem, fik hjortene reduceret meget af vegetationen til næsten ingenting, de bare græssede det væk.