Abstract
1. 1. When totally surrounded by air, the beaver is able to maintain a normal body temperature at ambient temperatures below 20°C. Above this temperature it becomes hyperthermic. 2. 2. If the air-surrounded beaver is allowed to keep its naked tail in cool water the animal's body temperature is maintained at a normal level also at an ambient air temperature of 25°C. In this situation heat loss from the tail to water amounts to about 20 per cent of the total heat production. 3. 3. It is concluded that the beaver's tail, like poorly insulated body parts of many other animals, has an important secondary function as an organ for controlled heat dissipation.
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