defintly weasel, they kill by attacking the throat. We have had one come in the barn and kill over 50 pigeons in one night, so they do kill for fun. the good thing is that they usually hang around, so take a gun with you into the barn(if you have one) and make a little noise. they are curious and will poke thier head up, and thats when you fix him. Also if its a male you will smell him, they stink like musk