 Such phenomena now occur only in isolated pockets, primarily in the Daurian Steppe and Tibetan Plateau.The floral communities of the Eurasian steppes and the North American Great Plains have been largely extirpated through conversion to agriculture.Nonetheless, as many as 300 different plant species may grow on less than 3 acres of North American tallgrass prairie, which also may support more than 3 million individual insects per acre.