Reproductive steroids as potential mediators of parental-reproductive trade-offs in a brood parasitic species

Avian brood parasites display enhanced annual fecundity compared with other passerine birds. Female brood parasitic brown-headed cowbirds (Molothrus ater) lay a staggering estimated 40-50 eggs year-1. We examined how reproductive steroids mediate a possible trade-off between increased annual fecundi...

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