GlobePedia on Instagram: "A duck may use its own body heat to defrost its beak when it gets cold or covered with ice. Ducks' unique blood artery system, known as countercurrent heat exchange, aids in controlling the temperature of their extremities, such as the feet and beak. Cooler blood returns through adjacent veins, whereas warmer blood from the body enters the beak through arteries. Heat moves from the warm blood to the cold blood because these vessels are adjacent to one another, limiting

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