- Narrator: Feasting on rich seal meat has made these the largest bears in the word. But now the Arctic is warming and the sea ice if melting away, making it harder than ever to catch seals.
- Adam Ravetch: As ice melts, walrus are stuck on land-so mothers must swim farther to find food for their young.
- Narrator: Diving beneath the ice takes courage. But for the people who devote their lives to studying the Arctic, taking risks is part of the job.
- Narrator: Each spring in Alaska, large herds of caribou set out on a long journey. No one has ever tracked the entire migration on foot, until now.
- Leanne Allison: Some of these calves are just a week or two old, and they're easy pickings for bears and wolves.
- Narrator: Caribou mothers are having a tough time, as the Arctic warms. But polar bear mothers face an even greater struggle.
- Narrator: She was always on alert. If she caught the scent of a male, she'd hustle the cubs off to safety.
- Narrator: The brave mother was willing to do anything to protect her cubs. But she's powerless to save the habitat they need to survive.
- Narrator: But the Arctic is warming faster than it has for thousands of years and losing its dazzling crown of ice.
- Narrator: Arctic animals need ice to survive. They live in a delicate balance with the natural world-mothers most of all.