I have this 17 day old Barred Rock chick from Ideal Poultry that has been standing hunched up and lethargic for the past few days. I looked it over when I first noticed it and I couldn't see anything wrong with it. The vent was clean, and nothing else was obviously wrong. So I thought maybe it would snap out of it. It hasn't. But it isn't acting any worse today either. Today I looked it over more thoroughly and discovered a lump in it's abdomen, below and slightly to the left of the vent. None of the other chicks have this lump. The lump is quite hard, and about the size and shape of a nickel. You can't see any kind of a lump, but you can feel it. I looked through my Storey's Chicken book and couldn't find anything about this. What could it be? Thanks for any help!