We have two 13 week old pullets. We have not let them out of their coop and run to free range because we are afraid they will not return. They go into the coop at night and hang out in the run for most of the day. At what age should we let them out to free range? There are no other chickens to teach them what to do. We have raccoons, possums, foxes, cats and other predators roaming around. We are afraid they will become a tasty meal if they do not return at night.