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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countercurrent heat exchange: https://en.wikipedia.org/wiki/File:Countercurrent_exchange.png
Penguin Feet: https://www.flickr.com/photos/cmichel67/16739668936
Adelie Penguins: https://www.flickr.com/photos/10004136@N05/3212303306
Penguins lifting feet: https://www.flickr.com/photos/elisfanclub/5955799837
Antarctica: https://www.flickr.com/photos/61172192@N00/5884680232
Antarctica 2: https://commons.wikimedia.org/wiki/File:Antarctica_(7),_Laubeuf_Fjord,_Webb_Island.JPG
Penguin Swimming: https://commons.wikimedia.org/wiki/File:Gentoo_Penguin_Swimming.jpg

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