Circus roustabouts are most commonly associated with circus animals, of course, but they also have a connection with game birds, at least in terms of etymology. "Roustabout" comes from "roust," which is an alteration of "rouse," a verb from Middle English that originally meant "to shake the feathers" (as in the way a bird might ruffle its feathers or shake its plumage when it is settling down or grooming itself). "Rouse," which today is a synonym of "awaken," also formerly meant "to cause to break from cover," a sense that may have influenced the modern meaning of "roust": "to drive (as from bed) roughly or unceremoniously."