The caribou migration is a veritable feast for grizzly bears — if the bears can catch them. "American Arctic" premieres Wednesday, April 13 at 8/7c on PBS. [VID: Grizzly bears chasing a herd of caribou. Transcript: Away from the water, the caribou start to relax. It's a mistake. Caribou may be faster than bears on the open plain, but they must also rest the calves. Grizzlies and polar bears are almost the same species and increasingly overlap and interbreed, but grizzlies are a more serious thre

When it comes to being at home in Alaska’s winter landscape, caribou (Rangifer tarandus) are pretty chill. Alaska has 32 distinct caribou herds, and you have a chance of seeing these hooved critters in almost all of Alaska’s 16 national wildlife refuges. Bull caribou drop their antlers in November, while pregnant females keep their antlers until their calves are born in May, meaning Santa’s reindeer, which are essentially the same species, are all female! Caribou bodies are incredibly well adapt

Caribou migration routes are under threat. Each year, caribou make migrations in their hundreds of thousands across the Arctic. But as the climate warms, their ancient pathways are changing - and so is the frozen ground itself. #OurFrozenPlanet tells stories that land the urgency of climate change whilst inspiring hope that change is possible for us and the health of our planet. Discover more ➡️ https://www.bbcearth.com/our-frozen-planet | BBC Earth