The Birds

Today there were six birds, the two really blue ones I thought might be the new babies and then there was another one added to the mix and the father was chasing him but they all settled on the line again and there was still one more in the house.  So are these the new children or just friends?  So confusing but fascinating.  They surely like Matt's bird house, it is a big one, but how can I ever get it cleaned out???  They will have to do that themselves.