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.
Feathers are featured very prominently in the Indian culture. The Indians used these feathers as a part of their ritual and as a spiritual tool. The type of feather being used became important when it came to its use in ceremonies; this is because of the meaning assigned to the particular feather type.Typically the birds that supplied the feathers were eagles, hawks and crows.The eagle played a significant role in Indian rituals and these were the most prized feathers. They were placed in the headdress of warriors to represent the victories and successes they achieved in battles.ypically the birds that supplied the feathers were eagles, hawks and crows. The eagle played a significant role in Indian rituals and these were the most prized feathers. They were placed in the headdress of warriors to represent the victories and successes they achieved in battles.