I cannot watch video with sound at work, but is the sound a high pitched scream type noise? I have heard a couple of mine do that on rare occations. (Once when I went to set one of them in the bath tub for a bath-I rarely bathe my ferrets, only when they get really dirty).
That polecat looks a lot like some of my ferrets. All of mine are private bred, & some do have some Polecat bloodlines about 10 generations or so back.
It's sad that the best option is to kill it, but I do understand protecting your stock.
when i first saw the picture, i thought gosh it looks like my ferrets did. im in the way too cute to shoot club. pests yes, so are racoons, but they have to eat too. and rabies, well when i see one in the daylight acting odd, i stay away. this guy looks fine. hope you let him go.
we had a preditor break into the coop and kill 4 hens, my hubby went out fixed the fence that was broken (you couldnt see it unless you were up close) and that was the end of the killings. although the coop and outside run are built very well, sometimes things happen. this happened 3 years ago.