title: ROLE OF EXTREME CHANGES IN PHOTOPERIOD IN THE ANNUAL CYCLES OF BIRDS AND INSECTS.
mesh_terms: D000222:Adaptation, Physiological; D001683:Biological Clocks; D001717:Birds; D002940:Circadian Rhythm; D003081:Cold Climate; D007313:Insecta; D008027:Light; D010507:Periodicity; D017440:Photoperiod; D010828:Physiology, Comparative; D012106:Research
keywords: ADAPTATION, PHYSIOLOGICAL; BIOLOGICAL CLOCKS; BIRDS; CIRCADIAN RHYTHM; COLD CLIMATE; EXPERIMENTAL LAB STUDY; INSECTS; LIGHT; PERIODICITY; PHYSIOLOGY, COMPARATIVE; REVIEW