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.
Dance is an important art form in India, and Shiva is believed to be the master of it. He is often called the Lord of Dance. The rhythm of dance is a metaphor for the balance in the universe which Shiva is believed to hold so masterfully. His most important dance is the Tandav.hiva is represented with the following features: 1  A third eye. 2  The extra eye represents the wisdom and insight that Shiva has. 3  It is also believed to be the source of his untamed energy. 4  On one occasion, when Shiva was distracted in the midst of worship by the love god, Kama, Shiva opened his third eye in anger.