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送交者: 006 于 2008-06-07, 20:45:50:
回答: 生物学问题:为什么许多鸟喜欢一条腿站着? 由 HunHunSheng 于 2008-06-07, 19:26:55:
Birds’ legs have an adaptation called “rete mirabile” that minimizes heat loss. The arteries that transport warm blood into the legs lie in contact with the veins that return colder blood to the bird’s heart. The arteries warm the veins. By standing on one leg, a bird reduces by half the amount of heat lost through unfeathered limbs.
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