This is my first hatch of banty cross heritage chicks. all went well, they have a momma who is full sized araucana and a really good mom. anyhow, yesterday one of the chicks I noticed was wobby legged. then sitting down. when I examined her she was very shaky and breathing heavily, could not stand for long. I separated her, much to mom's fussing, and mom and other chicks stayed close by the cage where I had her. she ate and drank, I gave her plain yogourt. she seemed interested in eating. then in the evening I put her back with mom and the rest and thought she might be gone in the morning. to my surprise she came out with the rest, seemed better but still wobbly. I did the same, put her in a separate cage within the chicken run. tonight, did the yogurt again and put her back with mom. she does not seem changed at the end of the day, no worse or better from yesterday. of note, when I hold her she seems to be vibrating, a nervous type thing. there are no visible marks on her legs or anywhere else, orifices all clean. all chicks had good flooring, no slippery stuff. help! is this marek's? kelly J.