Environmentalist Leanne Allison and wildlife biologist Karsten Heuer follow a herd of 120,000 caribou on foot, across 1,500 kilometres of rugged Arctic tundra. The husband-and-wife team wants to raise awareness of threats to the caribou's survival. They let the caribou guide them through a wild and remote landscape, from the central Yukon to coastal Alaska and back. During the five-month journey, they ski and hike across mountains, swim icy rivers, brave Arctic weather and endure hordes of mosquitoes. They survive an encounter with a hungry grizzly bear that forces them to reconcile what it means to be a part of true wilderness. Hunger, fatigue and pain become routine, but the sacrifice is worth it when they witness the miracle of birth just metres from their tent.
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