This lovely painting shows Leda and the swan (Zeus in disguise), with her twin sons Castor and Pollux, newly hatched, offering her a bouquet of flowers. It is unclear just how much of this painting was conceived by Leonardo da Vinci; you can read more about that here at AncientWorlds.net. Here is a depiction of Leda and the swan in the form of a sculpture.
You can also find more myths and legends for the week of November 18-24 here. For more information and links to the actual javascript code, see the Myths & Legends Widget Reference Page.