My girls are just over 2 weeks old. I’ve had a roost in their brooder for about a week. They took to it almost immediately - all the way up to the top tier. The last few days I’ve noticed them sleeping on it. This is my second batch of chicks and these 3 (ISA Browns) seem to be excelling at a crazy rate! Or maybe my last group was just slow? Or maybe it’s the breed? Any insight?