Rabbit Ears: Double Duty
The first thing you notice about a rabbit is its oversized ears which, as one might guess, enhance its ability to hear. The two ears can move independently of each other and can be rotated 270 degrees.
In addition to being designed to catch sound from any direction, rabbit ears regulate a rabbit’s body temperature. There is a very extensive network of blood vessels in a rabbit’s ears that provide a large surface area for heat exchange. These vessels swell (vasodilation) when the rabbit is hot, and contract (vasoconstriction) when it is cool, so much so that they are barely visible in cold weather. In the summer, the increased circulation of warm blood from the body’s core to the rabbit’s ears, where heat is lost to the cooler surrounding air, provides internal air-conditioning for the rabbit. (Photo: Eastern Cottontail)
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