Oil droplet distribution and colour discrimination in the pigeon.
D000818:Animals; D003118:Color Perception; D010856:Columbidae; D003623:Dark Adaptation; D004193:Discrimination Learning; D009821:Oils / Q000032:analysis*; D010786:Photoreceptor Cells / Q000032:analysis / Q000502:physiology; D012160:Retina / Q000032:analysis* / Q000502:physiology; D012168:Retinal Pigments / Q000032:analysis; D014794:Visual Fields
D009821:Oils; D012168:Retinal Pigments