we bought 9 cornish chicks at our local tractor and supply store. They are about 4 1/2 weeks old and growing fast! We will be filling our freezer soon. But I noticed on almost all of them around their lower neck, something that looks like a small tumor. it does not seem to affect them. They seem fine. Also one breast seems much larger than the other one. They almost seem lop-sided. Are these normal characteristics of cornish, because of their rapid growth, or is something wrong?