Crazy Bird Attack

Forgot one item. We obviously have a crazy bird living near by our house. I was downstairs with the boys and kept hearing a thudding noise (and some frantic scratching). Seconds later, I looked up and saw a bird flying straight towards our huge window, and hitting it, only to swoop down and come at it from a different angle. This went on for about 15 minutes. Finally, it stopped, but my curiosity about the crazy bird was piqued. I just wanted to rule out some new breed of crazy killer birds inhabiting our neighborhood. After a little research I read that this is common behavior for MALE birds, who have an excess of testosterone.....figures -LOL.