What is the Greater Yellowstone Ecosystem?

The Greater Yellowstone Ecosystem is one of the biggest 'almost completely preserved' ecosystems in the United States.

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At maximum extent, the ecosystem is 34,400 square miles in area covering parts of Wyoming, Montana, and Idaho.

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The ecosystem has one of the largest populations of grizzly bears outside Alaska.

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The ecosystem also has one of the largest elk herds in America.

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