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Same trait, different receiver response: unlike females, male American goldfinches do not signal status with bill colour, Troy Murphy, Joe West, T Pham, Lucy Cevallos, Richard Simpson, Keith Tarvin Troy G Murphy
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Condition and brightness of structural blue-green: motmot tail-racket brightness is related to speed of feather growth in males, but not in females, Troy Murphy, T Pham Troy G Murphy
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