Henny Penny, more commonly known in the United States as Chicken Little and sometimes as Chicken Licken, is a folk tale with a moral in the form of a cumulative tale about a chicken who believes the world is coming to an end. The phrase "The sky is falling!" features prominently in the story, and has passed into the English language as a common idiom indicating a hysterical or mistaken belief that disaster is imminent. Versions of the story go back more than 25 centuries. The moral of the story is a warning not to believe everything one is told.