How Penguins Beat the Heat and Went South

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Few animals have evolved to survive the unforgiving Antarctic like penguins. Species like the emperor penguin have overlapping layers of insulating plumage, tightly packed veins to recycle body heat and just enough paunch to weather wind chills that approach minus 80 degrees Fahrenheit. With all these cold-weather adaptations, it’s difficult to envision penguins living anywhere else. But fossil...

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