This was really fun (for me), but probably not for the wren. I updated my Audubon iPhone app and found out that the new version not only has all the field guide notes and pictures, but now has bird calls. So,,, by playing the wren calls I found that I could really get some aggressive behaviour out of them. They would fly right up to me, land and get their tails up and take a wild posture. Oh, yeah and give a real case of Stink Eye. Tomorrow, if the lighting is better, I will try for some photos. How to be annoying and have fun at the same time!