Outside my kitchen window is a lilac shrub. There are two song sparrows that are continuously flying from the lilac directly into the kitchen window. This is a bay window and they are flying into one of the side windows that is set at a 45 degree angle. Sometimes they hit the glass head-on, other times they land on the sill. Then they walk up the side of the window for no apparent reason. I have checked all over for a nest, and can't find anything. Any ideas what to make of this behavior? I also just had the windows cleaned (Friday), and that particular window is now totally tracked up with little bird footprints. I thought at first it was just so clean they couldn't figure it out. That is certainly not the case anymore! Weird.
