I have recently noticed a couple chickens with what looks like a large build up of fluid in the breast area. You can feel it and it moves and reacts like a large pocket of fluid similar to water. I think the one or two that show this are hens but I can not be sure I have never seen this in Roosters. I had one a couple years back that showed this and eventually died but failed to find out what it was and no one around me knew of anything that causes it or have seen it in any of their chickens. Anyone ever seen this or might have some ideas of what might cause this?