Daniel J. Cox / Gray Wolf (Canis lupus) predating female Elk (Cervus elaphus) crossing river, Alum Creek, Yellowstone National Park, Wyoming, sequence 4 of 4
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Daniel J. Cox / Gray Wolf (Canis lupus) killing female Elk (Cervus elaphus) crossing river, Alum Creek, Yellowstone National Park, Wyoming, sequence 3 of 4
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Daniel J. Cox / Gray Wolf (Canis lupus) attacking female Elk (Cervus elaphus) crossing river, Alum Creek, Yellowstone National Park, Wyoming, sequence 2 of 4
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Daniel J. Cox / Gray Wolf (Canis lupus) pair predating female Elk (Cervus elaphus) crossing river, Alum Creek, Yellowstone National Park, Wyoming, sequence 1 of 4
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Daniel J. Cox / Gray Wolf (Canis lupus) pack on ridge in winter, Lamar Valley, Yellowstone National Park, Wyoming
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Edwin Giesbers / Wide angle close-up of a European grey wolf (Canis lupus) in landscape, captive, Norway, February.
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Edwin Giesbers / Wide angle close-up of two European grey wolves (Canis lupus), captive, Norway, February.
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Edwin Giesbers / Close-up portrait of a European grey wolf (Canis lupus), captive, Norway, February.
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Edwin Giesbers / European grey wolf (Canis lupus) in snow, captive, Norway, February.
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Tim Fitzharris / Gray Wolf (Canis lupus) pack walking in snow, Montana
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Tim Fitzharris / Gray Wolf (Canis lupus) dark morph, Montana
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Ingo Arndt / Timber Wolf (Canis lupus) running in snow, Minnesota
