I had the bird pictured below in my yard in western Erie (Arapahoe and 287) on May 27. It actually flew into my window, flew into one of our trees to recover for a bit, and then flew off. It did not sing during its time in my yard. It seems to most closely resemble the Brewster's backcross adult depicted in Sibley's. Does this seem like an accurate ID? Thank you for any information!
Chris Pagliaro
Erie