We have 7 keets about 10 weeks old. Two weeks ago I noticed one of them sort of tiptoeing when it walks. It spends most of its time perched or hunkered down in their pen, but when it does walk, it doesn't use its whole foot--and this is true for both feet. I have no reason to think it's not eating or drinking, as it comes to the dish when I bring treats of mealworms and millet. It just seems to be painful to walk so it chooses not to do so. I've been adding vitamins to their water for the last two weeks but haven't noticed any improvement. They get a mix of chick and gamebird starter/grower. Any suggestions or thoughts as to what the problem might be?