This has been going on in this pen and another pen for quite some time we thought it was natural deaths then some pecking from other birds we got down to two birds both where killed then it moved about 50 feet to another pen and almost whipped it out, but we put one bird back in the original pen it started with and that night it got it, these pens are 3.5' off the ground and u can see from the pic we covered the top to make sure it wasn't a cat sitting on top of the pen reaching in any ideas on what this might be would be greatly appreciated Thanks for taking time to look over this