I just saw the birds that have their nest in the closet, and they are in fact european starling and not house sparrow. By seeing them enter, I know they are in fact in the wall and not under the floorboards. Baby starlings make me happy, too.

The right closet of my bedroom is filled with the squeaking of baby birds. There's a nest under the floorboards, which is where the roof meets the side of the house. The parents must be entering in a hole right above or below the gutter. By the frequency that I see house sparrow out front, most likely that's what's in there. Little birdies growing up right under my feet. It makes me happy, it's spring.