Luskick S, Battersby B, Kelty M
Science. 1978 Apr 7;200(4337):81-3. doi: 10.1126/science.635577.
Orientation toward the sun combined with postural changes minimized the net radiation gain on the adult herring gull during the breeding season. The decrease in absorbed solar radiation was due to reduced surface area exposed to direct sunlight and to reduced absorptivity since, when the bird orients toward the sun, the angle of incidence is such that only the white surfaces receive direct sunlight. At low wind velocities (0 to 0.6 meter per second) and ambient temperatures above the lower critical temperature, the birds rotated 180 degrees during the day, always facing the sun.
在繁殖季节，成年银鸥通过朝向太阳并结合姿势变化，将净辐射增益降至最低。吸收的太阳辐射减少是由于暴露在直射阳光下的表面积减小以及吸收率降低，因为当鸟儿朝向太阳时，入射角使得只有白色表面接收到直射阳光。在低风速（0至0.6米每秒）且环境温度高于较低临界温度时，鸟儿在白天会旋转180度，始终面向太阳。
