Figure 1. Vermivora spp. phenotypes considered in this study: Golden-winged Warbler (V. chrysoptera ; GWWA), Blue-winged Warbler (V. cyanoptera ; BWWA), ‘Brewster’s’ Warbler (hybrid; BRWA) and ‘Lawrence’s’ Warbler (hybrid’ LAWA). Males (♂) and females (♀) are both shown.