I lost a meat bird about a week ago to this problem and now I have another one acting the same way. First they start out walking around kind of wobbly. Then their legs start to stiffen up and they can't bend them. It's kind of like they got trampled or something. They have normal bowel movents, eat, and drink. But eventually they just can't walk anymore and pass away rather quickly. What is going on? What am I doing wrong? Will this happen to all of the birds?!