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

Caribou are a lifeblood that pulses across the Arctic landscape every year, and Alaska alone is home to 32 different herds. The Porcupine herd is one of the biggest, and has the longest land migration route of any mammal on the planet. Find out more about this herd, and its fate as drilling threatens its habitat in the Arctic Coastal Plain, in Threshold, Season 3, Episode 4: “Do It in a Good Way.” Listen at the link in our bio. 🎥: Arctic National Wildlife Refuge; Caribou Porcupine Management Bo

The Porcupine Caribou herd is one of the largest herds in Alaska. With numbers nearing 170,000 animals. This herd also completes one of the longest migrations on Earth. | The Wonder Channel

Photographer Katie Orlinsky takes us behind the scenes while photographing the aggregation of Alaska’s Western Arctic caribou herd. Read more: https://on.natgeo.com/3RzhZNz | National Geographic