I have a meat chicken about 4 weeks of age. I have raised and processed my own meat chickens before this year. I know that I have had some die a couple days after I got them. This time I have been lucky. However I noticed that I have one young meat bird fatter than the rest and sits all the time. It doesn't stand and doesn't walk even if I try to push it. It flew out of my hand and landed and just laid there again and didn't move. It will jump but wont walk. Is this because she is too fat for her legs to support her. I have separated from the rest of the flock so they don't pick on her or incase something is wrong. What are your opinions?