Black throated blue warbler.

Black throated blue warbler, Rondeau Provincial Park, Ontario, Canada, May 8, 2017.

Setophaga caerulescens
Unlike other warblers that molt into "confusing fall plumage," male Black-throated Blue Warblers keep their distinctive black-and-blue plumage year-round. The distinctive white square on the wing also helps ID females.
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