When observing the predator-prey relationship, it's fascinating to look at real world examples. The documentary 'Lords of Nature: Life in a Land of Great Predators' produced by Greenfire Productions tells the story of science now discovering the great carnivores as revitalizing forces of nature, and a society now learning tolerance for the beasts they had once banished.

Wolves and cougars, once driven to the edge of existence in the United States, are finding their way back - from the Yellowstone plateau to the canyons of Zion, from the farm country of northern Minnesota to the rugged open range of the West.

Watch 'Lords of Nature'

Using this same concept, we can use livestock to mimic this behavior and restore the grasslands of the world.