"Sometimes it seems that every bird has institutionalized one of my defense mechanisms. The cowbird lays her eggs in some other bird's nest to let them do the brooding job; the Baltimore oriole imitates the sounds of more dangerous birds to keep the enemies away, and the red-wing blackbird keeps screaming so loudly overhead that you get tired of her noise and soon leave the area that she considers hers. It does not take long to realize that I do all of that and a lot more to protect myself or to get my own will done."
Source: Nouwen, Henri J.M. The Genesee Diary: Report from a Trappist Monastery. New York: Doubleday, 1976.