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Science 24 January 1969:
Vol. 163. no. 3865, pp. 387 - 390
DOI: 10.1126/science.163.3865.387
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Articles

Bird Energetics: Effects of Artificial Radiation

Sheldon Lustick 1

1 Department of Zoology, University of California, Los Angeles

Radiant energy reduces oxygen consumption in birds; this reduction is correlated with feather color, being greater in dark birds (26 percent reduction) than in white ones (6 percent reduction). With radiant energy (basking), the cow-bird effectively increased its insulation, thus shifting the lower end of the zone of thermal neutrality down by as much as 10°C (35° to 25°C).


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