I'm going to build some training roosts for my little fluffy balls today. They roost on everything else, I might as well try to get them to do it on the right things. How wide should they be? These little ones are only 3 weeks. I was thinking just 1.5 inches should take them up to 7+ weeks. Heck my big girls, 15 weeks, seem to prefer the 1.5 inch ones to the 2.5 inch ones anyway. But is 1.5" too big at this age?