Skyeknight
Chirping
Definition of playing:Chickens don't play, but they seek entertainment when they are bored
Engage in activity for enjoyment and recreation rather than a serious or practical purpose.
Playing is a form of entertainment, you could argue what exactly is playing behaviour in chickens. For example foraging for food can be a type of "playing" since they will do it even if they have unlimited food available. Since chickens are very social creatures a lot of social intereactions could fall under playing, especially in young chicks.