I have a secure run and coop, however because it is winter I lock the pop door at dusk. There have been a lot of predators that I have seen lately and I'm thinking the scarcer food is just might give a hungry predator more motivation to get real creative. I believe my run & coop is sturdy enough to keep everything but bears out. But why take a chance.If you have a secure coop attached to a secure covered run (is that an oxy moron??), is it still necessary or advisable to lock chickens in the coop from dusk to dawn? Is there any benefit to leaving the door open to the run and letting chickens decide for themselves? Or is that just asking for trouble (ie predators) no matter how much you think your run is fort knox?