Swan Song

"Swan song" is a metaphorical phrase for a final gesture, effort, or performance given just before death or retirement. The phrase refers to an ancient belief that the Mute Swan (Cygnus olor) is completely silent during its lifetime until the moment just before death, when it sings one beautiful song. The belief, now known to be incorrect, had become proverbial in Ancient Greece by the 3rd century BC, and was reiterated many times in later Western poetry and art.