Influences of sex hormones on the loud and soft warbles of male budgerigars.
D000704:Analysis of Variance; D000728:Androgens / Q000494:pharmacology*; D000819:Animal Communication / Q000187:drug effects; D000818:Animals; D001717:Birds; D002369:Castration; D004777:Environment; D006062:Gonadotropins / Q000494:pharmacology*; D007552:Isotonic Solutions / Q000494:pharmacology; D008297:Male; D010919:Placebos; D012726:Sexual Behavior, Animal; D013637:Tape Recording; D013737:Testis / Q000502:physiology; D014828:Vocalization, Animal / Q000187:drug effects*
D000728:Androgens; D006062:Gonadotropins; D007552:Isotonic Solutions; D010919:Placebos