ultrafacts: How Wolves Change Rivers Yellowstone National Park had become overrun with deer, which grazed away the vegetation dramatically. For years, biologists like Dave Foreman suggested a solution: bringing wolves back to the park, as the last

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ultrafacts: How Wolves Change Rivers Yellowstone National Park had become overrun with deer, which grazed away the vegetation dramatically. For years, biologists like Dave Foreman suggested a solution: bringing wolves back to the park, as the last

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