If that's 1/2" HC, that hole is like 10" x 7", way too big for a weasel.I'd say it would be a weasel, those things find your hens abnd kill as many as possible. They go for the brain and throat and leave behing "vampire" bite marks. He will return at night for his feast and kill more. My advise, leave out a rat trap will slice deli meat.