Penguins are one of the least bird-like birds getting around. We're told we should never judge a fish by its ability to fly, but this is a bird that wants to be judged by its ability to swim. Where the heck did Penguins come from, why did they abandon the sky and how do they stand on ice all day without getting frost bite? These are all questions, and if you join me on this journey you might even get a couple of answers.

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Notes:

• Counter-current heat exchange: https://en.wikipedia.org/wiki/Countercurrent_exchange
• Countershading camouflage: https://en.wikipedia.org/wiki/Countershading