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Caribou
A hundred thousand caribou must face hungry bears and wolves, deadly frozen rivers and rugged mountains as they undertake the world's longest land migration - 3,000 miles through the frozen Arctic wilderness of Canada and Alaska.
Episode Clips
Caribou Face a Gauntlet of Bears
The grizzles have just woken up from 6 months of hibernation, and they're starving.
The Herd Gets Back on Track
With just 13 days left until they go into labor, this herd still has 180 miles to go.
Bear Gets Too Close for Comfort
In open landscape, a bear has a hard time catching caribou - but not humans.
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