I watch mine when they are out of the run, but they're not full grown yet. When they're too big for a cat or hawk to want to mess with, I'll let them out by themselves some, too. We have hawks and eagles here, but it seems that the crows do a pretty good job driving them away. I think we have a crows nest in or near the yard. Our fence is too high for them to get out or dogs to get in.