Rondeau Ric

Blue-winged warbler hybrid "Brewster's Warbler", Rondeau Provincial Park, Ontario, Canada, May 10, 2019. This makes the full set for the year, golden-winged, blue-winged, Lawrence's and Brewster's something I haven't done before. Vermivora cyanoptera Hybrids tend to develop into one of two distinctive plumages, which early naturalists at first thought were separate species: "Brewster's Warbler” (which looks like a Blue-winged Warbler with a white chest), and "Lawrence's Warbler" (which looks like an all-yellow Golden-winged Warbler). source - https://www.allaboutbirds.org/…/Golden-winged_Warb…/overview

Brewster's warbler , a photo by ricmcarthur on Flickr. The Golden-winged warbler and the Blue-winged warblers hybridize where their ranges overlap. This results in two types Brewster's and Lawrence's warblers. The resulting bird has a combination of field marks.