Sons or daughters? Female finches use head colour to decide

(PhysOrg.com) -- Researchers studying the behaviour of the stunningly coloured Gouldian finch have made an exciting discovery - females of the species deliberately overproduce sons when breeding with a male of a different head colour.

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<p><a href="http://www.physorg.com/news156706578.html">Sons or daughters? Female finches use head colour to decide</a></p> <p>(PhysOrg.com) -- Researchers studying the behaviour of the stunningly coloured Gouldian finch have made an exciting discovery - females of the species deliberately overproduce sons when breeding with a male of a different head colour.</p>