Not sure. We've never seen anything around but the little brown bunnies that eat all my lettuce and the neighbors cat, who is fat, sassy and old. Raccoon is most likely i think. Whatever ti was came back last night. I had tided up the yard, IE. putting excess baby bird parts in a plastic bag, which i left tied up on the porch. It was riped open and parts were mostly gone. I'm worried about my big birds now. I usually don't close the coop door and I've seen no evidence of digging around the pen but I'm going to be making some changes there.