Vermivora chrysoptera x VERMIVORA cyanoptera Status: Rare casual spring and fall migrant east. Documentation: Brewster’s Warbler: photograph, 18 May 2020 Madison Co (Brogie, in gallery); Lawrence’s Warbler: photograph 25 May 2021 Sarpy Co (Swanson, in gallery); F2 or later backcross. Taxonomy: This species and Blue-winged Warbler V. cyanoptera hybridize frequently and produce fertile hybrids; their […]