Dog trainers learn to clicker train chickens to improve their skills. They use chickens as a model for learning the theories and mechanics of animal training. Chickens are quite unforgiving and if they don’t like how you are training them, they simply fly off. Your timing has to be impeccable to get any results. You can’t force them to do anything. Contrarily to dogs who want to work with humans and will put up with all kinds of bad techniques.
Here is Marjo learning to peck out the Queen of Hearts from a deck of cards: