I gotta give a plug to an app I really like. I'm not affiliated in any way, other then being a happy user.
I like to sit on the back patio in the evenings and listen to the birds. Cornell University's Lab of Ornithology has developed a bird ID application that works on either iPhone or Android. It will help you identify a bird based on visual cues, and can also "Listen" and tell you what birds it hears.
A really cool app that I use almost daily.
Identify Bird Songs and Calls Sound ID listens to the birds around you and shows real-time suggestions for who’s singing. Compare your recording to the songs and calls in Merlin to confirm what you heard. Sound ID works completely offline, so you can identify birds you hear no matter where you ar
merlin.allaboutbirds.org