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.
June 04, 1987|BURT A. FOLKART | Times Staff Writer. Will Sampson, the gentle Indian giant best remembered for his portrayal of the feigning mute chief in the alternately amusing and poignant film One Flew Over the Cuckoo's Nest, died Wednesday in Houston.