Whale Health Spa | Frozen Planet II | BBC Earth

Did you know bowhead whales have the biggest mouth on the planet? Their four-metre long baleen plates are the longest of all whales, enabling them to sieve out up to six tonnes of plankton a day. Thanks to all that eating, they grow swiftly into eighteen metre, one-hundred ton giants. And even giants need to pamper themselves from time to time...

This six-part series – narrated by Sir David Attenborough – explores the wildlife found in the world’s coldest regions: the Arctic and Antarctic, high mountains, frozen deserts, snowbound forests, and ice-cold oceans. From polar bears to penguins, and from snow monkeys to Siberian tigers, each species must overcome a unique set of challenges to endure its extreme environment.