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Subject Area:Neurology and Neuroscience
Journal: Brain Behavior and Evolution
Brain Behav Evol (2005) 65 (4): 268–277.
Published Online: 15 April 2005
..., indicating T dependency. During the breeding season, second-year (SY: birds entering their first breeding season) free-ranging male Dark-eyed Juncos (Junco hyemalis) have smaller testes than older (after second-year, ASY: birds entering at least their second breeding season) birds. SY males also have lower...