Szukana fraza: [Abstract = "In contrast to the captive males, most wild sparrows \(7\/9\; 77.8%\) produced sperm on 14 July and all of them had completely black beaks. Captive males had significantly less black on their beaks and smaller combined testes mass than did wild males. We found sperm in the testes and seminal glomera of wild but not captive sparrows. These results are consistent with the conclusion that the captive males suffered a decline in testosterone levels with subsequent physiological effects."]

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