Mirrors can make your male become aggressive when mature and if so will attack his own image non stop until he kills himself from exhaustion from trying to kill the other bird. Not all do but on the add chance yours does become a psycho nut you wont be able to free range him at all or he will attack your brand new shinny blue F 150 with chrome trim all the way around and scratch the shinny off with his bloody spur less busted up stump from trying to kill your truck. Or any other vehicle he can see himself in he will also attack like your girlfriends right front quarter panel of her nice new blue shinny Jeep or the chrome bumper on some random fly fishermens new Toyota,.., how do you explain that one to your insurance,lol. but honestly a peacock did this !