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    Emperor Penguin

    Wind chill can reach -76°F on the Antarctic ice, but emperor penguins have a few tricks to keep warm. To endure the harsh weather, they have four dense layers of feathers, specialized nasal chambers that recover 80 percent of heat lost through breathing, small extremities and a thick layer of fat.

    The large birds (they're about 45 inches tall) also huddle together to protect themselves from the biting wind, each taking turns in the warmer shielded interior. Emperor penguins are the only animal that breeds during the Antarctic winter, so they need all the help they can get.