Figure 1.

(a) Diffuse (solid lines) and (b) specular (dashed lines) smoothed reflectance spectra of species with (a) glossy and (b) matte black plumage. (a) Black, double-crested cormorant; red, common raven; green, fish crow; blue, magpie-lark; light blue, acorn woodpecker; purple, Caspian tern; yellow, turkey vulture; grey, yellow-bellied sapsucker. (b) Black, yellow-billed cacique; red, horned grebe; green, Baltimore oriole; blue, northern flicker; light blue, black-mandibled toucan; purple, California quail; yellow, house sparrow; grey, American goldfinch. (c) Boxplot of glossiness values for glossy and matte species.