Rondeau Ric

Sept 23, 2020, Rondeau Provincial Park, Ontario, Canada. A blue wing/golden wing crossbreed. First time in the yard. Sixteen warbler species in the yard in one day, 43 species overall, what a great day! Vermivora cyanoptera x chrysoptera This bird does not rise to full species level but is a hybrid of two recognized species, the Golden-winged Warbler (Vermivora chrysoptera) and the Blue-winged Warbler (Vermivora cyanoptera).

Golden-winged warbler hybrid "Lawrence's Warbler", Rondeau Provincial Park, Ontario, Canada, May 4, 2019. A rare find at the park, took lots of images, none of them close. Vermivora chrysoptera 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