Brewster’s Warbler

Where their ranges overlap, Blue-winged Warbler and Golden-winged Warbler may hybridize, producing the dominant Brewster’s Warbler with the facial characteristics of the Blue-winged and the body coloring of the Golden-winged, or the rarer backcross doubly recessive Lawrence’s Warbler with the facial characteristics of the Golden-winged but the body coloring of the Blue-winged. Various subsequent generation backcrosses with each other or with either parent species also occur. Genetics.