We have a flock of 50 dark and white cornish chicks. They've been cooped up until yesterday when we thought they were big enough to run away from predators, they were all about 2lbs. So opened the door to the coop to let them free range...things seemed ok and we left them for an hour this morning. When we came out to check on them all were killed except for 3! the poor little babies were still warm when we picked them up. Everyone in my house is distraught. How do we keep these birds of prey away effectively? Please help!!!