How can I get my 4 pullets to sleep on the roosting bar? Right now, they only sleep in a certain nesting box, and lots of poop accumulates in it, and it just gets really messy. They know the bar is there- at least I have seen two of them on it. Whenever I take one of the other 2, who I have not seen on the roosting bar, out of the coop, the 2 of them will hop up into their roosting bar and start peeping for their sister to come back. Either way-- they will not sleep up there, and the nesting box is becoming a pain. Will they just go up their in time or do I need to train them in some way?