Thank you for the suggestions. He is a lot better this morning. He slept through the night in a pet crate. We then constructed a small pen in the basement and placed him down there. No longer has a dumped tail, eating and drinking well, actually crowed several times.
He is still shaking his head a lot. Unless he is focused on something like preening, he stands there and shakes his head intermittently, then more, then less… My question is this, are Northern Fowl Mites something that occurs during the middle of a northern winter? There were no signs of this head shaking in the previous weeks, and all seven birds have been acting as normal as chickens can act.
So… is this a common occurrence in the very cold, northern Michigan region or is there another issue that I should be looking at?