Today I noticed that one of my hens breast area is largely swollen then usual. It wasn't that way yesterday or ever, accept for today. It looks and feels like she is carrying a lot of fluid in this area and when you touch it, it swishes around. Does anyone know what is the cause and do I need to be worried about this. Please respond back to me if anyone has any idea. This concerns me completely. She is only one in a half years old. Thanks.