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Even though it's the world's largest land predator, every polar bear starts out as an adorable blind, toothless cub. But how does a helpless cub become a stone cold killer? See how a polar bear cub follows its mom on hundreds of hunts over the course of two years - watching, learning and mostly getting in the way. To survive in the Arctic, polar bears have to have brains as well as brawn, and know when to use different tactics for taking down different kinds of prey.