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Seasonal fluctuations in plasma testosterone levels and diurnal song activity in free-living male great tits

Animal PhysiologyBreeding BehaviorDiurnal Song ActivityBehavioral NeuroscienceEvolutionary BiologyPhysiologyBehavioral NeuroendocrinologySeasonal FluctuationsReproductive BiologyPublic HealthEndocrinologyMedicineAnimal BehaviorReproductive HormonePlasma Testosterone LevelsReproductive Endocrinology