So I noticed this morning that a 5-mo-old cockerel I have isn't standing up. This is the first I've seen this problem, and I picked him up to check and see if anything was wrong with his legs. His legs and feet seem fine, other than that his toes are curled. This makes me very worried that he may have Marek's, so I am keeping him separate from the rest of the flock until I know. His comb is still small and pink for his age, but I had figured that that was because there are dominant roosters around him and he's lower on the pecking order. Diet wise, he has been getting water to drink, no vitamins or supplements, and whole or cracked grains to eat - red wheat, corn and barley with molasses (sweet feed for horses) It's the same food the rest of my chickens and turkeys get. He gets let out with the two pullets he was raised with to forage every so often. They mostly eat grass and whatever they can find around the yard right now, with it being wet and icy. I can't think of anything toxic he would have gotten into, unless he tried some berries off our English ivy and they didn't agree with him. He is usually kept in a large dog carrier with the two pullets, as they are small and I've been worried about it being too cold for them. They have pine shavings in there and I try to make sure they have enough and that the litter is clean enough. I remove it when it gets too damp from them knocking their water over or when it's too soiled from use. The pullets are fine. I may start the cockerel on some vitamins and yogurt to see if it helps. Advice?