The coop is only accessible by a small door on the front and has chicken wire and aviary netting and a solid roof/walls (converted horse stall). The entire turn out area is fenced with 4 foot high electric mesh netting.
We have 4 groups of birds (including one in the next stall over) and have not lost birds from any other group.
Doesn't look like a large predator....but at this point I'm drawing a blank.
The bellow picture is tonight's bird and this was done quickly (I checked them like 2 to 3 hours prior).
WARNING GRAPHIC PICTURE BELLOW