Why don't penguins stick to the ice?

 Although it has a body temperature of 39°C, a penguin's feet are always cold. While that may sound uncomfortable to us, it is thanks to this adaptation that the birds can stand on an icy surface without it thawing, and since no liquid water is formed, their feet do not stick to the ice. To ensure that the feet away stay cold, the flow of blood is restricted. Veins and arteries in the legs are surrounded by muscles that are able to contract so that the blood supply is kept to the minimum necessary ti maintain the temperature of the feet at just above 0°C. Since this also cools the blood, it is necessary to ensure that it is not too cold when it returns to the body. It is therefore directed through numerous small blood vessels and past warm arteries, becoming warmer as a result.

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