Birds are back

This nest seems to have been under construction for about two weeks; walking outside just a few nights ago I startled this guy, and when he flew away I thought itmust have been a bat (early evening, twilight). The nest went up in fits and starts over the last month, but the big build seemed to take just a day (someone must be motivated) and the moss blanket on the exterior of the nest in just a day.

This nest is on the top of the window frame on the south porch, the westernost window facing south from the living room. Good luck little guy!