A lone Arctic wolf runs at the large caribou herd, to try and flush out the young or weak.
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Watch more:
Planet Earth http://bit.ly/PlanetEarthPlaylist
Blue Planet http://bit.ly/BluePlanetPlaylist
Planet Earth II http://bit.ly/PlanetEarthIIPlaylist
Planet Dinosaur http://bit.ly/PlanetDinoPlaylist

Taken From Planet Earth II
In one of the most ambitious landmark series, Planet Earth II allows us to experience how animals meet the challenges of surviving in the most iconic habitats on earth. Travelling through jungles, deserts, mountains, islands, grasslands and cities, this series explores the unique characteristics of Earth's most iconic habitats and the extraordinary ways animals survive within them. New technology has allowed individual stories to be captured in an unparalleled level of detail.

Welcome to BBC EARTH! The world is an amazing place full of stories, beauty and natural wonder. Here you'll find 50 years worth of entertaining and thought-provoking natural history content. Dramatic, rare, and exclusive, nature doesn't get more exciting than this.

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