Szukana fraza: [Abstract = "Black beak color in male House Sparrows \(\"Passer domesticus\"\) is a secondary sexual characteristic whose expression is directly correlated with testosterone levels. To experimentally determine if social environment affects black beak color and by implication testosterone levels, we housed wild\-caught male sparrows either individually \(n = 10\), \"Solo\" males, or in the company of two other males \(n = 4 \"Group\"s of 3 males\), \"Group\" males, from 26 May \- 7 July 2006."]

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