I have 3 mutt chickens that are 11 1/2 weeks old. They look pretty skinny but I think I'm just used to my full grown hens that are so plump. My main concern is that they're are feathers everywhere. I clean them out and the next day there's a ton. Could there be something wrong with them? I dont remember my other babies "shedding" so much. And they're not fighting or anything like that to cause the feathers to come out.