Vermivora chrysoptera x cyanoptera Status: Rare casual spring and fall migrant east. Documentation: Brewster’s Warbler: photograph, 18 May 2020 Madison Co (Brogie, in gallery); Brewster’s Warbler apparent backcross (F2 Brewster’s and Golden-winged) with Blue-winged Warbler: photograph, 21 May 2020 Sarpy Co (Swanson, in gallery). Taxonomy: This species and Blue-winged Warbler V. cyanoptera hybridize frequently and […]