Wavelength perception and colour vision.
D000818:Animals; D001000:Ants; D001516:Bees; D001717:Birds; D003118:Color Perception / Q000502:physiology*; D004175:Diptera; D005399:Fishes; D006801:Humans; D008163:Luminescent Measurements; D008297:Male; D010786:Photoreceptor Cells / Q000502:physiology; D012168:Retinal Pigments / Q000032:analysis; D012542:Scattering, Radiation; D013053:Spectrophotometry
D012168:Retinal Pigments