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Why Don’t Penguins’ Feet Freeze?

How do they do it? Penguins standing on ice, not only for days, but their whole lives! And their feet don’t hurt like ours would. It has something to do with blood and an amazing twist that penguins have developed.

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Sources:

Images:
countercurrent heat exchange:
Penguin Feet:
Adelie Penguins:
Penguins lifting feet:
Antarctica:
Antarctica 2:
Penguin Swimming: