I have a chicken coop twice as big as I need for my 8 birds. The first group of three are 10 months old and later I added 5 more that are now 5 months old. They have been exposed to each other from the very beginning but were section off in the coop. They are all free range now, but the original 3 won't let them in the coop at night. So I have 5 birds crammed into a teeny coop built for two! It's hardly suitable for inclement weather, and I would like to use that teeny coop for something else - like chicken jail or a chicken hospital! They are all friendly to each other, and all the birds are all in and out of the large coop all day, except for night. What can I do?