Thousands of Porcupine Herd caribou during the annual aggregation event in the Arctic National Wildlife Refuge, Alaska
Courtesy of Max Hug Williams
Join 100,000 caribou who 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.
Nature's Great Race: Caribou airs Wednesday, July 19 at 9 p.m. on PBS 6.
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