Avian botulism is frequently called "Limberneck" because of the floppy necks of the dead and dying birds. According to Merck's it causes "Leg weakness and paresis that progress to flaccid paralysis of the legs, wings, neck, and eyelids are characteristic clinical signs...Weakness is the earliest sign in waterfowl. Birds are initially reluctant to fly when approached and have weak wing-beats and difficulty taking flight. As the disease progresses, they lose their ability to fly and exhibit stumbling gaits and eventually paralysis." He's showing paresis of the legs, 3rd eyelids are partially out, and some weakness in the neck. The first day his feces also had larger quantities of urates (also a symptom of AB), but have since become more normal. He's still alive and eating and drinking today.
He doesn't fight with anybody as no animal on the farm has the courage to call his bluff. He did get whacked on the neck with a cotton lead rope the day before when he came charging out of his stall hissing at me. Both Mr. Bramblefir and myself are doubtful that it would have caused this as I only flicked the lead rope out enough to tap him and remind him of his manners.