Do I have to worry about my birds sticking to my metal birdbath?
Unlike humans, birds don’t have sweat glands in their skin to produce any moisture to freeze to metal in the winter. Heat and moisture are accumulated in sacs, transferred to the lungs and eliminated through the mouth. The only way a bird's feet would stick is if they were fell asleep there during freezing rain, and the rain froze around their feet.
Also birds’ feet are mostly bone and tendons, so unlike mammals, they have a limited supply of nerves, blood vessels or muscles to freeze. And their feet are covered with scales which isn’t a living tissue and less susceptible to freezing.
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