I have a year old polish rooster that was found "resting" in a nesting box yesterday. He was having a hard time keeping his head up and his wings are dropping. His poop is a greenish color, and he is allowing us to hold him (not his usual style). This onset was very sudden, yesterday morning when I left for work he was up and about like normal, and my husband discovered him in the nesting box in the evening. We separated him and cleaned all the shavings out of the coop as a precaution. I'll add some pictures of the droppings, but they're more green in person than I can capture in photos.