Definitely a mink. If a live trap doesn’t work you can try a 110 body grip trap. That is a killing trap though so you’ll have to take it down when your birds are out and about.
That is kinda strange. How old is he? I’ve had some that were slower to feather out before but it’s been kinda rare.
I do have one stag from this year with leg problems 1 out of I think 22 hen hatched eggs. I would expect some issues here and there out of an incubator but not from a hen. 🤷🏼♂️
Another fox terrorizing my chickens. This is the second one with mange and it was worse than the other. I felt bad for him. Just sad all around no chance he was able to keep warm at night.