Whether they have any extant function or not, they have lost their former function and in that sense they do fit the definition of vestigiality. Vestigial structures are often called vestigial organs, although many of them are not actually organs.
There are quite a few birds famous for doing ritualized mating dances, so I would only list 5: The Red Capped Manakin, The Black-footed albatross, The Western and Clark's grebe, The Superb bird of Paradise, & The Victoria's riflebird.
Description. Mourning Doves are our most slender dove, with a long pointed tail, and fairly narrow pointed wings held close while flapping; however, on takeoff they produce a light airy whistling on takeoff. Song of a Mourning Dove is a mournful hooting ooAAh cooo cooo coo, often mistake for an owl.ourning Dove. Distribution. Mourning Doves (Zenaida macroura) are found in all counties of the Texas Panhandle, in every month of the year, and are an important migratory upland game bird.