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. ...See moreStep 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.
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