my chicken is 11 wks old. she is white. i don't know her breed but she and the three others like her grew ridiculously fast! i suppose as a result they all lay down a lot. this one won't get up now. she wouldn't get up to eat and seemed to be in a bit of distress so we brought the food and water to her. the only thing that looks different from her "siblings" is that her tail feathers look a bit discolored. like charcoal--around the base. she doesn't seem to have mites or anything. her vent is clear. does this sound familiar to anyone?