I have two khaki Campbell ducks about 4 months old. One just started acting out of sorts yesterday. Doesn't seem to be drinking or eating normally. Stands in one spot and kind of closes its eyes. Doesn't seem to want to swim. She can "talk" when she choose but not as much as usual. I checked her neck area, seems soft, no lumps like something is stuck. Not sure what's going on. Any help/info is greatly appreciated