Our chicks are about two and half or 3 weeks old. They are in a 4 by 8 cage that i built in our basement. They are basically not going under the momma heating pad anymore but sleeping on top of it. The entire thing is lined with poplar shavings and they are playing and digging in those. Do i need to give them something to roost on? I will move them outside at about 4 or 5 weeks old as we have 4h chicks coming also.