We were blessed this year with visits from this immature male rose breasted grosbeak and an adult male. They stopped at my sunflower seed feeder to stock up for their migration down to Mexico(?)As was the case in 2010 when we last had a visit from an immature male, I expect they will be gone in a day or so.
Read about their migration here: http://www.citizen-times.com/story/sports/outdoors/2015/04/29/nature-journal-rose-breasted-grosbeck-capital-world/26571101/