Seasonal fluctuations in plasma testosterone levels and diurnal song activity in free-living male great tits.
D000704:Analysis of Variance; D000818:Animals; D001824:Body Constitution / Q000502:physiology; D002940:Circadian Rhythm / Q000502:physiology*; D008297:Male; D012098:Reproduction / Q000502:physiology; D012621:Seasons; D020308:Songbirds / Q000097:blood*; D013739:Testosterone / Q000097:blood*; D014828:Vocalization, Animal / Q000502:physiology*
D013739:Testosterone