In A Microscopic Meal of Algae and Krill, narrator Sir David Attenborough describes how, as the ice melts in Antarctica, the Southern Ocean becomes a robust feeding ground. Tiny krill fill the ocean, creating the perfect food source for crabeater seals which are ready to dive in and dine. This video is excerpted from BBC’s Frozen Planet, a series that shows a fragile world of beauty and hostility, where nature finds a way to survive and thrive in frigid conditions.