Just curious...I live in the city near Diversey & Ashland. While out walking my dogs - especially in the morning - I have been hearing a lot of "knocking" sounds. Maybe ten to twelve in a row then it stops and then ten or twelve more etc. Are there woodpeckers in our area? I don't remember hearing this in the past. I love seeing and hearing all of the different wildlife and was just wondering if this sounds like woodpecker behavior. Thanks!