Brewster's warbler.
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
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