The Bonus: If your cats are anything like mine, chances are that this site will have them swatting at your computer's speakers. The Drawback: I can't tell you how disappointed I am though to finally confirm that Roadrunners don't go "Beep! Beep!"
Let's All Sing Like The Birdies Sing.... Don't know the difference between the Pigmy Nuthatch and the Common Redpoll? Can't imitate a Northern Bobwhite's whistle if your life depended on it? Well, sounds like you need to get to practicing your birdcalls, and if you can't find out the sound it makes here, chances are it just don't make noise.