I've got 3 new chickens, have had them a week now. They are all 22 weeks old and are laying 2 - 3 eggs a day. I have built them 2 perches inside their house, with a ladder attached, but not one of them is using it. They all sleep in their nest boxes and so end up pooing in there, and laying eggs directly on top of the poo. The nest boxes that we have made are really just divisions and are not able to be closed off. Every day I pick them up and place them on the perches outside and they seem to enjoy being on them, staying there for a few minutes at a time, but again, they never use them through their own accord. How can I get them to use the perches by themselves?