I have 5 hens, all the same age. I have a large coop that they live in and they have loads of space to run around in both inside and out. My question is... Everyday 3 hens go in to the coop to roost, however the same 2 always stay outside and sit on a pile of wood! How can I either teach them or entice them into going inside in the evening! No matter what time in the evening or night, they won't go inside on their own!