Ducks, along with many other aquatic birds, are waterproof enough to float. This ability comes from the combination of feathers, down and excellent water repellency.
But how do they stay comfortable over such a wide range of conditions? The temperature flexability of their insulation is extraordinary, coping with life on the water (water conducts heat about 24 times more effectively than air) and on the wing, where they suffer constant wind chill.
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