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By the Light of January's Wolf Moon
Icons of the wilderness, wolves howl across northern landscapes like Yellowstone National Park.
Credit: USFWS
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On the lookout: A wolf watches for prey through a snow-covered forest.
Credit: USFWS
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The Blacktail. The Agate. The Silver. Yellowstone is home to several wolf packs.
Credit: Yellowstone National Park
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Wolves hunt an elk in Yellowstone's deep winter snows.
Credit: NPS/Dan Stahler
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Members of Yellowstone's Gibbon Pack pause to greet one another.
Credit: NPS/Doug Smith
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The Gibbon Pack takes cover in winter in a Yellowstone conifer forest.
Credit: NPS/Doug Smith
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