Friend has a 14 week old bird that has both legs laying flat under her with feet going forward. One foot has curled toes. Chick is eating, drinking and pooping fine. If food is put right in front of her. No roo to damage her. No other harm that she knows of. Food stored in airtight containers, all birds eating same food. They have not been outside yet. Only one lame bird in flock of 4. All same age, same breed, and acquired at the same time. Since both of her legs are forward as opposed to the one leg forward one leg back position of Marek's, we thought nutritional problem. Eyes look normal. No mites, lice. If you turn her over, she will try to move the leg without curled toes. Has been inside for 2 weeks, feeding cooked eggs, pellets, yogurt, and is supplementing with vitamins. Showed slight improvement in mobility for a few days they regressed. Her weight seems fine. Would only one bird have come down with a nutritional problem if they are all eating the same food? Any ideas?