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How Feathers Insulate
© M Kuhn
A single Canada Goose has between 20 and 25 thousand feathers. Some are designed to help the bird fly or shed water. Many are the short, fluffy kind, the down that insulates the bird from the cold. Birds survive in sub-zero weather by fluffing their feathers, creating layers of air and feathers. Just a fraction of an inch of this insulation can keep a bird's body temperature at 104 degrees, even in freezing weather. Seen here are the feathers of a Brown Pelican.
This is BirdNote!
Bird sounds provided by The Macaulay Library of Natural Sounds at the Cornell Lab of Ornithology, Ithaca, New York. Calls of the Canada Goose  recorded by G.B. Renyard.