Update: We are calling these guys 'the chorus', tho they are not as noisy as some nestlings i've heard. If you look close you will see there are 5 of them. Yesterday i opened the screen door to let dogs out and the air around me seemed full of swallows swooping by as if in greeting. Some still seemed uncertain of their wings and they did return to the nest safely. What a rush! It was so grand seeing them, tho the adult birds seemed to feel it was a bit too soon and seemed to be trying to steer them back to the nest.