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Swans
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Why do swans often tuck one of their legs up behind their wing when they are in water?
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For more on marking an answer as the "Best Answer", please visit our FAQ.The leg-up is nothing more than a relaxation position, just as most humans cross one leg over the other when seated.
Because of restricted capillaries, the blood temperature in legs and feet of a bird is a lot lower than the rather warm body temp of 39+c. to prevent body-heat loss through the feet. To cool down all birds hyperventilate and to warm up they fluff their plumage out thereby increasing the insulating layer of air between the feathers and body.
Because of restricted capillaries, the blood temperature in legs and feet of a bird is a lot lower than the rather warm body temp of 39+c. to prevent body-heat loss through the feet. To cool down all birds hyperventilate and to warm up they fluff their plumage out thereby increasing the insulating layer of air between the feathers and body.