So I have a Polish cockeral, Russell, who I found weak and still inside the coop this morning after the rest of the bunch came out. He's not quite four months old, and has been going through a growth spurt and a molt. He is underweight, he looks like he should weigh a lot more than he does. His keel bone is very pronounced, I just don't feel much "meat" on him. He's been able to eat outside with the other birds, they aren't bullying him away from food or water. None of my other chickens are showing any sign of feeling poorly. The temp last night got down to 12 degrees, and it's supposed to be single digits the next couple of nights. I have him in the house now, in a plastic tote with pine shavings and bowls of food and water. He has been eating and drinking, did a little bit of preening, but mostly he's been sleeping. He'll stand for a short time, then his head just droops and he lays down. His breathing seems heavy, but steady, and he's not gasping. He is alert, he pops his head up when we walk past him. I scrambled an egg for him, I'll offer it to him after he rests a bit. I think what's going on is his body can't handle the growth, molting, and trying to stay warm all at the same time. It just seems like he's utterly exhausted. Other than bringing him in where it's warmer, offering extra food and rest, is there anything else I can do? Any particular miracle food or goodie that might help?