I have some 4 week old Cornish Cross that I let out to free range all day, and then confine in a horse stall at night for safety from predators. While out, they also have access to all the feed and water they want, and water when in the stall at night. Since I started letting them out, they hate being locked in, when I open the door they all bolt out, and they won't go back in at night on their own, I have to find and catch every single one and carry it screaming and kicking back in. The last week or so, I noticed a few of them had scabs on their heads, I thought maybe my big loose rooster had been bothering them, so I penned him back up. There were still some fresh wounds showing up though, and they seemed to be freshest looking in the morning...And today, I opened the stall door to find four dead and ripped to pieces with the others all covered in their blood! They're not big enough to process yet, so I've got to figure out how to stop this for the next 4-6 weeks... They only seem to be doing this during the night/early morning when they are confined. They are not overcrowded, there is plenty of space for all of them. Should I just leave them loose all the time? We have a fox that hangs around, she might eat some of them....but if they keep eating each other, what's the difference? I can't cage them all individually.