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Possible models of hormone effects. Model A, the body (contour) feather is the default type. Sex hormones influence whether a “male” or “female” feather will develop. Model B, the “female” is the default feather type. Androgens cause a transition to a “male” feather type. Model C, the “male” feather is the default and estrogen converts the feather to a “female” feather type.
