We are new (probably obvious) and so are learning as we go. I would like to ask for some wisdom from the flock. Two of our beautiful birds have developed firm lumps on their chest. They seem to be in good spirits and not in any pain, but it's a new development and so we worry. My diagram is calling this the "crop", but I do not know much more than that. Are our beautiful birds sick? Is there something we should do? Please forgive my ignorance, I am trying to research, but you folks seem very bright. Please advise--we will be ever grateful.