I have mentioned before that my older chickens (NHR) pick on the younger ones (2 Hubbards + 15 Cornishx Rocks). Lately, though, they've been playing favorites. . . In the pen, they are equal-oppportunity bullies. At night, though, they have been allowing one of the little eggers (Wild Thing) to roost with them. What gives? Are they simply too tired to rumble by lights-out? Or do they have a bias against our broilers?