Will they be back?

Just outside one of my office windows there is a bush. It borders our parking lot and last year there was a tremendous amount of noise coming from it. You see, in the summer the bush is very dense with leaves and you can't see any branches.  We discovered that a bird had made a nest and the babies were of an age when they were constantly chirping at mom for food.  Such tiny birds can make such a racket! The nest is still in the bush which you can see since it's winter and the branches are barren.  I don't know [...]