As herds of elk and bison are gradually weakened by the cold, one animal gets stronger - the wolf. Chased down by the pack, Yellowstone's herds have little resistence as the wolves move in for an easy kill. Dramatic clip from BBC's natural history series Yellowstone. Visit http://www.bbcearth.com for all the latest animal news and wildlife videos and watch more high quality videos on the new BBC Earth YouTube channel here: http://www.youtube.com/bbcearth
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