Henny Penny a.k.a Chicken Little
Wikipedia: “The fable is also known by the name of other characters such as Chicken Licken or Chicken Little (USA), and by the phrase ‘The sky is falling’ that occurs there. It is an old cumulative tale about a chicken who believes the world is coming to an end. The phrase ‘The sky is falling’ has passed into the English language as a common idiom indicating a hysterical or mistaken belief that disaster is imminent.
“There are several versions of the story, but the best-known concerns a chick that believes the sky is falling when an acorn falls on her head. She decides to tell the King and on her journey meets other animals who join her in the quest. After this point, there are many endings. In the most familiar, a fox invites them to his lair and there eats them all.”