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What features would an animal need to have to adapt to a Polar region?
They would need to have protection against the cold (thick fur or skin with a lot of fat-blubber), and camoflage it white, they would need to be waterproof in some way to swim, they would have to cope with a diet of fish, krill, penguin, and have a way to catch it, they would have to have some way to grip the ice with their feet or slide on it, they would have to adapt their eyes for brightness