Hello, My chickens are about 12 weeks old. They are just starting to roost on the high roosts in the coop. Right now I have the three nest boxes covered with a piece of plywood so they cant get in them. I figured that I would let them get use to roosting first, hoping they won't sleep in the nest boxes when I uncover them. My question is: When should I uncover the nest boxes so they will know to lay their eggs in them? Should I have never covered them? Also what is the deal with the chickens running up to each other and chest bumping? Thanks.