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FILE - In this March 21, 2019, aerial file photo provided by the National Park Service, the Junction Butte wolf pack rests in the snow in Yellowstone National Park, Wyo. Yellowstone National Park's wolves are becoming more genetically similar after years of inbreeding, but researchers say the population remains healthy and the similarities could help them fight the skin disease mange. (National Park Service via AP, File)

FILE - In this March 21, 2019, aerial file photo provided by the National Park Service, the Junction Butte wolf pack rests in the snow in Yellowstone National Park, Wyo. Yellowstone National Park's wolves are becoming more genetically similar after years of inbreeding, but researchers say the population remains healthy and the similarities could help them fight the skin disease mange. (National Park Service via AP, File)

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