I had a cardinal run itself into one of my windows for days. I pulled the blinds, closed the curtains, taped torn pieces of colored paper and magazine pictures to the window ( I didn't have clings) and none of it worked. After 3 or 4 days it stopped. I thought the bird must have killed itself but I couldn't find it's body anywhere. I've heard people say it's lasted for weeks at their house. Keep us posted.