What is a duck thinking?
Serene up top. Absolute chaos underneath.
The feet never stop, and the legs are built to make that cheap. A duck has a countercurrent system in its legs where warm outgoing blood heats the cold returning blood, so it can paddle in near-freezing water and lose almost no body heat doing it.
The serenity on top is oil. Ducks work waterproofing oil through their feathers constantly, which is why they sit high in the water rather than in it.
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