Hey. I don't know but since a couple of days my duck is facing a weird problem. At times something white (an organ kinda tube ) comes out of her butt when she's pooping or applying pressure (like when my duck tries to bite my clothes she applies a lot of pressure n that organ kind of thing comes out ) I have absolutely no idea what's it? Apart from this , I suppose my duck is normal , it is weak as compared to others since the time I bought it. But apart from that I don't know if I am missing on some symptom? My 3 ducks are kept very clean though.