We started with 2 chicks and 2 ducklings. Everyone is penned separately at night, but free range together during the day. This weekend we lost a duck We are concerned about remaining duck knowing they need companionship. However, the duck has started hanging with 2 chickens. Is this ok? Don't want the duck to be unhappy, but she seems ok? All three are put in same coup at night so duck isn't alone. Thoughts ?