Birds
In birds with webbed feet, retia mirabilia in the legs and feet transfer heat from the outgoing (hot) blood in the arteries to the incoming (cold) blood in the veins. The effect of this biological heat exchanger is that the internal temperature of the feet is much closer to the ambient temperature, thus reducing heat loss. Penguins have them also in the flippers and nasal passages.
Read more about this topic: Rete Mirabile
Famous quotes containing the word birds:
“Tomorrow let loveless, let lover tomorrow make love;
O spring, singing spring, spring of the world renew!
In spring lovers consent and the birds marry
When the grove receives in her hair the nuptial dew.”
—Allen Tate (18991979)
“Alas, so all things now do hold their peace:
Heaven and earth disturbed in no thing:
The beasts, the air, the birds their song do cease;
The nightes chare the stars about doth bring.”
—Henry Howard, Earl Of Surrey (1517?1547)
“When you have shot one bird flying you have shot all birds flying. They are all different and they fly in different ways but the sensation is the same and the last one is as good as the first.”
—Ernest Hemingway (18991961)