Ok, this is bad. I extended my chicken run in June and thought it was secure. There are four hens in a very secure coop inside my run. I added four chicks into the run who were 10 weeks old. They have their own smaller coop. That is to keep the old and new separate until they are older. Didn't think about it again until 7 days later going up to the run, something was wrong. It was too quiet. I found the four chicks dead. Thought it was those Argentine ants. Then realized a week later, something else was likely the culprit. So, I decided to leave some cat food out in the run to test a theory. Well, the food was gone the next day, and it had to be something big. I bought a trail camera and kept baiting a trap, not an actual trap, but, one that could attract a predator so I can tell whether there was a break in the run fencing. Believe me, this run is tight, so I am not sure how the predator t is getting in. Last night, I caught it in the camera. It is a opossum. Question now is how is it getting in. Climbing over top, a wire fence completely over the top is already there? I have no know entrance underground. There is hardware cloth all the way around and there is no underground breach. The ground is too hard and really full of roots anyway so, I would be able to see any place it would even try to dig. And there is no signs of that. Every connection from the end of a fence to the next fence is tight! So, tonight, the camera angle is changing until the breach is found.