Photoreception in sparrows.
D000818:Animals; D001717:Birds / Q000502:physiology*; D001766:Blindness / Q000503:physiopathology; D008297:Male; D009929:Organ Size; D010507:Periodicity; D010786:Photoreceptor Cells / Q000502:physiology*; D013737:Testis / Q000033:anatomy & histology