I know this sounds like a stupid question, but how exactally do you free range? I have 15 little guys (5 1/2weeks old) and I'm scared if I turn um loose, I'll never get um back. They are still in their brooder, but I did take them out in it last weekend for some sun shine. I made the bottom of their brooder open so I can kinda use it like a chicken tractor without wheels. I was scared to just let them go. If you do free range, do you still need a coop to put them up at night? How does that work?