My 5 mo. old bantam frizzle cochin roo was fine Friday. On Sat. when I let them out, he looked sleepy. I put him in an enclosure with the almost 4 wk. old youngsters he's been surrogate mother/fathering and he acted fine, scratching & clucking to the young ones, eating, drinking, picking at grass, etc. I went back to check on him about 1 1/2 hrs. later and he was standing with head drooped as if he were preening his belly feathers, but not moving. I could tell something just wasn't right, so I brought him in & put him on a heated pet bed with yogurt and scrambled eggs. I gave him some PolyViSol vitamins dribbled along one side of the beak. He halfheartedly took them, but didn't eat more than a nibble or two of the yogurt. I set back down on the warmer, and he settled down as if to sleep. An hour later I could tell he was on the verge of death. I wrapped him in a warm towel & held him while he died. I saw no mites, but he was underweight. He HAD been vaccinated for Marek's at the hatchery he came from. I also have a silkie splash roo that is very wobbly (he was having difficulty just standing up in the wind). I've brought him in the house now, too. His appetite seems ok; his droppings seem normal in consistency but have quite a bit of white urates in them. He's drinking ok. I gave him some yogurt & cottage cheese, and he's eating crumbles as well. I'm going to give him PVS as soon as I finish this post. Any thoughts or suggestions? He is approx. one year old and has been fine up to this point. I appreciate your time and input. Thanks in advance.