Get you a long staff and a white robe and LISTEN to Peter...and protect your flock!!
Just kidding....
I let mine out for free ranging only for a few hours every evening...they get MAD at me if I do not let them out. I always stay outside...and watch them....usually while I'm working in the garden.
NEVER leave them out past dusk...HIGH predator probability.
I have free rangers, I accept that I will lose one on the occassion. Dogs keep the predators out of the yard, cats keep rats, snakes, & mice under control. I have a red heeler mix and a lab mix.