So yesterday we let the chickens (we have 4 and they’re all full grown and pretty big) out of their run to free-range at around 6am (as we’ve been doing for a few months now) All of them were fine, but then a while later we went to check on them (at around 8am) and we found their feathers scattered, one missing, but the rest were at different places in the yard, dead but without any injuries that we could see. Granted, we didn’t look too closely, but we couldn’t see any blood or anything. Any idea what could have caused the attack? We want to figure out before we get new ones, so we know how to avoid another attack.