I have 17 bantams housed with 2 Dominiques, 3 ducks, and a dog cage full of baby chicks in a 12x12 coop with plenty of roost space. The older birds are all around 13 weeks of age. I know everyone can get on the roosts as I see them on there throughout the day and evening. However, as soon as the light goes off at night, the only birds roosting are the 2 Dominiques and a Polish. All of the other chickens pile on the floor in a corner. I can't think of any reason to not let them continue doing so but this is my first time with chickens so I may be missing something. I have tried placing them on the roosts but they still end up on the floow. Why would most of the chickens not want to roost? And, is there any problems with allowing them to continue sleeping on the floor? The coop has a cement floor covered by about eight inches of pine shavings and I practice the deep litter method. Thanks for any advice!