On April 12, I kept hearing this weird scratchy/scriffly sound coming from my wall-unit air conditioner. I went out to check several times and didn't see anything. But upon closer look, I noticed that a bird was attempting to build a nest on top of the unit and the grass and sticks just kept falling into the unit through the air vents. I grabbed a wooded tray, picked up what I could of the nest and placed it on the tray as I slid it over the top of the AC unit. I hoped the bird would come back.
robins?