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One hundred thousand caribou face starving bears and wolves, deadly frozen rivers and rugged mountains, as they undertake the world's longest land migration - 5000 kilometres through the frozen Arctic wilderness of Canada and Alaska.Liz Bonnin leads a team of scientists and film-makers and uses cutting-edge technology to follow the herd, and reveal unique insights into the individual lives of these extraordinary animals.The caribou must reach their calving grounds before they give birth; failure would spell disaster.

Episode Title: Episode 2
Airs: 2016-05-18 at 21:00