Digital Commons @ Trinity

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

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