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Opposed results in wood warblers and in these finches indicate the existence of clade-specific trade-offs in the evolution of birdsong. This article is protected by copyright. All rights reserved. This article is protected by copyright. All rights reserved.Sexually selected ornaments are highly variable and the factors that drive variation in ornament expression are not always clear. Rare instances of female-specific ornament evolution (such as in some dance fly species) are particularly puzzling. While some evidence suggests that such ra
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