Well-known literary works based on these traditions include Lithuanian folk tale Eglė the Queen of Serpents ("Eglė žalčių karalienė") and the Latvian folk fairytale "The grass snake's bride" ("Zalkša līgava"). These works include another common theme in Baltic mythology: that grass snakes wear crowns (note grass snake's yellow spots) and that there is a king of snakes who wears a golden crown. In some traditions the king of snakes changes every year; he drops his crown in spring and the other snakes fight for it (possibly based on the mating of grass snakes).