Hi, one of my ducks is acting a bit strange. When she's walking her neck seems to be fatter and closer to her body more than usual and she seems bigger. She is also making quite a bit of noise-quacking for no reason like she would if she was being chased (she's normally a very quiet duck). I have never had a sick duck before only sick chickens and I know that they are quiet when they are ill not loud like this duck but I can tell a difference in this girl. She is still laying ok. Does anyone have any idea what it could be to narrow it down, or is it just a sign of illness in general? or maybe it isn't a sign something is wrong? We recently put 3 young ducks in with them could this be some sort of reaction to that? They seem to get on ok and mostly ignore each other though. Thanks for any insight.