Endocrine correlates of alternative phenotypes in the white-throated sparrow (Zonotrichia albicollis).

Abstract excerpt

Many vertebrate species exhibit alternative phenotypes (or morphs), in which one sex displays phenotypic variation equal to or greater than the variation between the sexes. Males in such species typically display differences in reproductive strategies and morphology. Steroid hormones such as testosterone are known modulators of reproductive behavior and morphology and therefore are obvious candidates for the...

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