One of the most commonly heard noises you will hear in the woods, near a body of water, at night, in the Eastern United States, is the trill of the Eastern Screech Owl. Eastern Screech Owls are usually monogamous, but sometimes the male is a sex-starved jerk and will mate with a second female.
These owls also regurgitate all the non-digestible things they eat, like the beaks of other birds, or the fur or bones of small mammals, in oval barf-pellets. They like to eat smaller birds, which is gross if you think about it. If you want to witness some of these puke-packets, you could build a nest box near some trees and maybe an Eastern Screech Owl will move in and eat all the small mammals near your house.
Animals for Sam 