We live in far south Texas. We built a chicken tractor made of cattle fence and covered in 18 gauge hardware cloth and a tarp. We got up a few days ago to find something had chewed our tarp all around the bottom and finally chewed a 4" hole big enough for the predator to get in through the cattle fence which is 4" holes. We had 16 chicks 4 - 8 weeks old. 12 were just laying dead around their home. After a few hours we had 1 pop up out of nowhere wanting to get back in. The other 3 were never seen. There was no blood, no destroyed bodies, however we did find a wing under one of the chicks. We were all shocked to wake up to this. So sad! We do not know what animal could do this. But I found out a neighbor had the same thing happen to his coup several weeks ago. I made many phone calls looking for some kind of help and finally talked to a game warden who is suppose to come out today and talk to us. We would like to know what animals can do this and how to try and trap it. I think it lives in our area since I know of 2 incidents and who knows how many more. We are sick about this and are new to raising chickens. Any advise would be appreciated.