Could you see their little heads and beaks poking out of the nest? Every year birds try building a nest in this spot. Scott usually "discourages" them before they lay eggs but we must have been snoozing this year and some cowbirds snuck it up there.
I don't know what kind of bee this is but it was HUGE! That board it is sitting on is a real 1"x 6" board and that bee took up ever centimeter of it. We've had wood bees burrow into some of this overhang wood before but I never saw any this big. Maybe this is the queen?