Abstract
1. 1.Solar reflectivity of the plumage of a glossy black bird, the male of Phainopepla nitens, is strongly affected by angle of incidence. 2. 2.The absolute change in a bird's net heat flux associated with angular effects probably is minor compared to other avenues of heat gain. This suggests that conventional measurements of reflectivity at near-normal angles of incidence are adequate for most applications and implies that the glossy appearance of dark-coloured birds may serve primarily behavioural functions.
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