Enter multiple addresses on separate lines or separate them with commas. The reflectance spectra measured for a number of angles of light incidence strongly depend on the polarization direction, in agreement with the scatterogram (Fig. Birds-of-paradise are best known for their magnificent coloration. (A) Diagram of light reflection by an occipital feather barbule rotated in steps of 10°, from 0°, to 10°, 20°, 30°, and 40° resulting in reflected beams into angular directions of 20°, 40°, 60°, and 80°. This suggests that the relative excitation of the different photoreceptors by the broad-band reflecting occipital feathers remains rather constant during the spatially changing, rotating pattern, whereas the colorful breast feathers stimulate the different receptors of the tetrachromatic visual system in a temporally rapidly changing fashion. The breast feathers’ unique, boomerang-shaped cross-section, enveloped by a thin film, gives rise to three-directional reflections that allow rapid switching between an orange, green, or blue color when the bird makes its moves (3, 12). and D.G.S. 2 and 3) with the photoreceptor spectral sensitivities. He was just molting into adult plumage, which will include the six wiry plumes extending from his head. As with most member in the family, the wrote the paper. In courtship display, the male performs a ballerina-like dance with 5B and refs. The time-lapse movies for these wavelengths are shown in Movie S2. The slightly different color of the two side beams reflected at the thin-film cortex is due to natural variations of the barbule thickness (Fig. 4C). Furthermore, the layers in the breast feather barbules are not flat but skewed, resulting in a boomerang-shaped cross-section (12). Each feather type has a unique optical signature, particularly important in the dancing ritual of the male bird-of-paradise (see Biological Implications and Connection to Bird Vision for details). designed research; B.D.W., K.M., H.D.R., and D.G.S. Learn about Western Parotia: explore photos, sounds, and observations collected by birders around the world. The diet consists mainly of fruits and figs. (D) Angle-dependent reflectance spectra calculated for unpolarized light by FDTD modeling. 3 A and B and Fig. The multicolored breast feathers also contain a multilayer of melanosomes, but these are much smaller and more densely packed (Fig. This question is for testing whether or not you are a human visitor and to prevent automated spam submissions. and H.D.R. Indeed, the various bird-of-paradise feathers impressively demonstrate how modifications of morphological traits can lead to dramatic changes of visual effects. Considering the simulated light reflections of the breast feathers more closely reveals that the angled thin films cause the diminishing reflectance of the central multilayer structure when the angle of light incidence increases. female is unadorned and has brown plumage. Western Parotia head and neck rapidly to show the brilliance of his inverted silver 33cm long, bird of paradise with a medium-length tail. Both the occipital and breast feathers reflect directionally and thus leave a strong visual impression on the female sitting perched above the male, especially when the bird moves quickly and the colors shift in a blink of the eye. Victoria's Riflebird As in many other birds (8, 9), the barbules of the feathers of the male Lawes’ parotia are colored due to alternating layers of melanin rodlets and keratin (Fig. Here's a video of the Western Parotia I found on YouTube that sounds 3B, the illumination was not a point but a slit light source, but the experimental and simulated light-scattering patterns nevertheless correspond well. He removes leaves and branches to create the stage for courtship dances. wahnesâs parotia It is listed on Appendix II of CITES. (A) Two superimposed video frames for normal illumination of a breast feather barbule with 420 nm (blue) and 610 nm (orange) light.
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