Photoperiodic synchronization of circannual rhythms in the European starling (Sturnus vulgaris).
D000818:Animals; D001683:Biological Clocks; D001717:Birds / Q000502:physiology*; D008027:Light; D008297:Male; D010507:Periodicity; D012098:Reproduction; D012621:Seasons; D013737:Testis / Q000033:anatomy & histology