The One Legged Bird

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 un-feathered limbs.

Source: http://birdnote.org/show/why-birds-stand-one-leg

Captured by me.
Captured by me.
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