Status symbols of house sparrows

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Bericht 04-06-'10, 16:32

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Status symbols of house sparrows

http://www.sciencedaily.com/releases/2010/...00604073715.htm


ScienceDaily (June 4, 2010) — The size of the black breast bib -- the badge -- and bill colour of male house sparrows change over the course of the year. Such ornaments usually signal quality and dominance of a male to his conspecifics and are correlated with his testosterone levels. These levels are generally higher before and during breeding season than for example during moult in autumn
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