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The wolf is such a keystone as is the grizzly as well as the beaver. All these species have experienced wide variance of population as we humans interfered and now with our elementary, but growing understanding of ecosystems try to undue damage we have done.
Native American legend across the country holds that the Great Spirit built the land, made the seas, and filled both well with animals and people: Long, long ago when the Great Waters surged in a blind and shoreless world, the gigantic beaver swam and dove and spoke with the Great Spirit.
Yellowstone’s abundant and diverse wildlife are as famous as its geysers. After the reintroduction of the wolf all of the wildlife species that inhabited the park when it was first explored over 100 years ago survive today qualifying Yellowstone as the only intact eco-system in the lower 48 states.