I have just put up the roosts in my chicken coop this week. The chickens are about 12 weeks old now and have been in the coop for 3 or 4 weeks now. I went out to let them in tonight and they are all on the roost and they are trying to walk over each other and they are standing on each others neck. Why are they doing this? Is there something wrong with them? It's 68 degrees out, so I don't think they are cold, but I could be wrong. Does anyone know why they are doing this? I don't want them to kill each other.