Have you ever watched ducks out on an icy lake paddling around in the near-freezing water. They will spend much of the day in that one spot with the temperature well below freezing, and yet the cold doesn’t seem to bother them. Perhaps on shore there are some sparrows hopping around in the snow. One wonders: why don’t birds need shoes and socks?

REF.: Why don’t duck’s feet freeze? Science Digest, Feb. 1984. p. 76. Photo: Penguin - Courtesy of Roux. (CC-BY-SA 3.0)

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