We have (had) 16 guineas from JM Hatchery. They are 3 months old and have been doing great. They free range all day and in the evening come home to their pen and some dinner. We live on a 24 acre wooded property in North Carolina, and I don't believe they are traveling beyond our woods at this point. A few days ago, one of the males was just standing off by himself kind of staring into space. He wasn't eating and just didn't seem "right". He seemed a little wobbly and let me pick him up without any fuss at all. I isolated him as I was worried about something infectious, and the other guineas tormenting him. The next morning he couldn't stand. He couldn't eat or drink on his own, and couldn't swallow unless we held his beak closed. His poops were normal (although small). If we put him on his back he could push back with his legs, and he could move his wings and flop around, so he wasn't exactly paralyzed but had no coordination of any of his movements. There was no sign of injury that we could see. After two days of him not improving, and steadily losing weight, despite our efforts to force feed him hummingbird food to get some calories and fluid into him, we sadly euthanized him. So far none of the other guineas or chickens (4 months old) are showing any signs of illness. Has anyone seen anything like this before? I am wondering if maybe he had a stroke. If he had something like Marek's disease would we not have seen other sick birds by now? Any suggestions or advice would be most welcome as this is our first experience with these funny and lovable birds, and are not sure if there was anything we could have done to prevent this.