Sorry. I recently lost a rooster name Henry also. Glad you got that mink! We got a weasel the other day that killed 7 of my hens.
I do know the threat of "angel wing" is true. One of our ducklings had angel wing last spring. This of course, was before I learned it was from food issues. I can't remember exactly, but it was either protein or vitamins that was the problem. The more natural green stuff they can eat on their own, the better.
I'm sorry for your loss.
My flock is in a run but get out sometimes to free range. I have had issues with both lice and roundworms. They can pick up things from a mouse or chipmunk. I wouldn't fret so much. Take it as it comes!
I went to let my flock out to spend the day outside this morning, and no sooner had I opened the door, I saw one hawk up above the run. I quickly had to shoo them back in. I let them out this afternoon while I could stand guard. They took their dust baths and I put them back in. I fed them and watered them in the coop. I came out, and sure enough, there it sat.
Will be stringing up fishing line tomorrow after school. Got a few thousand extra yards? (Attaching it to the tops of the fence and stringing across).