Lustick S
Science. 1969 Jan 24;163(3865):387-9. doi: 10.1126/science.163.3865.387.
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 degrees C (35 degrees to 25 degrees C).
辐射能会降低鸟类的氧气消耗；这种降低与羽毛颜色相关，深色鸟类（降低26%）比白色鸟类（降低6%）的降低幅度更大。通过辐射能（晒太阳），褐头牛鹂有效地增强了自身的隔热能力，从而使热中性区的下限温度降低了多达10摄氏度（从35摄氏度降至25摄氏度）。
