The Greater Yellowstone Ecosystem is one of the last remaining large, nearly intact ecosystems in the northern temperate zone of the Earth. It is partly in Yellowstone National Park. Its management has been controversial: the area is a flagship site for conservation groups that promote ecosystem management. The Greater Yellow Ecosystem (GYE) is a kind of natural laboratory in landscape ecology and geology. It is a world-renowned recreational site, and home to the animals of Yellowstone.