This is something that we just wanted to have a little fun with given the silly theme of the game. There is no official ruleset regarding the chicken. In play testing, we've seen groups do a variety of things with the chicken. Some will use it when they are involved in the Cluck Off and Chicken Dance Party. We've even seen some groups make house rules around using the chicken. There is no real purpose other than just having some fun, which is what this game is all about.