I know this is not new for many of you, but it is easily the most frequently asked question each spring. It is also the same reason the woodpeckers drum on your downspouts and/or flashing around your fireplace. Plain and simple it is “love”. The birds banging into your window repeatedly are seeing their reflection and think it is an intrudor in their territory. He or she is doing its best to run this freeloader off. The only guaranteed solution is to cover the window on the outside for the next few weeks (nesting season).