FIGURE 2 in A distinctive new subspecies of the Royal Sunangel (Aves: Trochiliformes; Heliangelus regalis) from the Cordillera Azul, northern Peru

FIGURE 2. Reflectance spectra from crown feathers of the holotype (top) of Heliangelus r. johnsoni (MUSM 22613) and a representative specimen (bottom) of Heliangelus r. regalis (LSUMZ 81851). Reflectance extends into the ultraviolet (300–400 nm) in both specimens. The holotype of Heliangelus regalis johnsoni exhibits a sharp reflectance peak at 464 nm. Crown feathers of all male H. r. regalis are only dimly reflective and the reflectance spectra are relatively flat (peak at ~486 nm).