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Bumblebees regulate their thoracic temperature when foraging for nectar. At ambient temperatures below 24° the thoracic temperatures is maintained at 32° to 33° at ambient temperatures above 24° the thoracic temperature rises. See page 185. [Photo courtesy of U.S. Department of Agriculture, Washington, D.C.]


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Science. ISSN 0036-8075 (print), 1095-9203 (online)