Hostile Planet Polar

시즌 1, 에피소드 6: Step inside the most frigid habitats on Earth — the poles. Here, the planet’s ultimate survivalists include whale-hunting polar bears, leopard-seal-dodging penguins and a pack of Arctic wolves that can bring down a pair of musk oxen. Evolution has helped polar species combat the intense hostility of their habitats, but their world is changing rapidly and their resilience will be tested.