Bird Feet Biology
Why don't birds feet freeze during the cold winter months?
I'm not sure about all birds, but ducks have what is known as a counter
current heat exchange mechanism in their legs and feet. Warmth flows from
more warmth to less warmth naturally. As blood flows down the legs from the
body it meets with colder blood coming back up and the warmth flows into the
colder part of the foot.
K. Van Hoeck
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Update: June 2012