I see some people keep their chicks "free range" and let them wander around the open yard. Others I see in a confined space... I have plenty of land and just bought a huge roll of wire fencing. I would like to install the fence and put the coop inside of it and let the chickens roam around their large area with the coop left open. Is this a bad/wrong idea? Im guessing I should close them in their coop at night to keep them safe from animals, but would they be fine durring the day? & if the space is quite large will it really be nessasary to have a cover of some sort to keep them from flying out????