Watch the awesome fight for survival as a grown male polar bear takes on a walrus colony at the edge of the Arctic circle. WATCH MORE: Hiroshima: http://bit.ly/BBCHiroshima Horizon: http://bit.ly/BBCHorizon Best of Alan Partridge: http://bit.ly/BestOfAla...

Watch the awesome fight for survival as a grown male polar bear takes on a walrus colony at the edge of the Arctic circle.