I built a new coop & run this year. I forgot about putting roosts in it until my chicks were about 10 weeks old. They are about 4 months old now and it seems that none of them want to use the roosts. Every night when I check on them, they're just huddled in the corner on the floor. I know that they're warm & safe so it begs the question, why do I care that they won't sit on their roosts at night?