Hi, I started anew this year with five chicks that I got in early April. So, the girls are now about 13 weeks old. I keep them in an old shed, with a room I close them in at night that has two sets of roosts as well as nesting boxes. I'm getting a bit concerned that they still haven't shown any desire to sleep on their roosts, instead huddling together on the floor. Is this an instinctive behavior that will develop on its own, or did they need older chickens around to show them it?