title: THE EFFECTS OF PHOTOPERIOD ON TESTICULAR ACTIVITY AND AGGRESSIVE BEHAVIOR OF STARLINGS.
mesh_terms: D000374:Aggression; D000818:Animals; D001522:Behavior, Animal; D001717:Birds; D003624:Darkness; D006801:Humans; D008027:Light; D008297:Male; D010507:Periodicity; D017440:Photoperiod; D010827:Physiology; D012106:Research; D046749:Starlings; D013737:Testis
keywords: AGGRESSION; BEHAVIOR, ANIMAL; BIRDS; DARKNESS; EXPERIMENTAL LAB STUDY; LIGHT; PERIODICITY; PHYSIOLOGY; TESTIS