I've known Elvis, our rooster, has not been feeling well since the first cold snap. Then, he quit going out to scratch with the hens. His comb faded and he quit avoiding us so strenuously. Then, the other day, he just let Jason pick him up.
This morning he was lying in the same spot in the coop, not roosting, that he was yesterday morning. The hens were being kind enough, which for chickens means they were not pecking at him. I figured he was probably happier with them as he shuffled off, so I let him be. This evening when I went to do chores, he was still in the same spot, but the hens were scratching hay over him so that his back half was covered. He was still looking around, and this seemed wrong to me. I tried to get him to move, but he wouldn't, so I gently moved him to another spot. He rolled over on his side, which is not a position chickens mostly choose, and then the hens began to investigate. SO, I moved him again, at which point he went into death throes.