I am new to chickens for the most part. My chickens are still young and growing. I leave them in their area which is all fenced in, my problem is that they are still not going in at night to their coop. I do have a duck, which I think is a bad influence on the chickens... My question is this normal at this age. Or do I have to do something different. I am getting tired of putting them in at night one by one.