One of my chicks has very wobbly and unstable legs, and looks drunk when she walks. She will be two weeks old on monday, and when I first got her she used to bully everyone and run around despite her small size. But now, she doesn't look well. She is on the same feed as the others, and was on straw from day one. She is the smallest of the bunch but is feathering as fast as the rest, and is a Buttercup. Any ideas? I already lost one a few days after I got them to a birth defect, I really would rather not lose this guy too. I took a video also (she is isolated from the rest, they literally walk all over her). I would skip to twenty seconds in.