My female bantam mallard duck sort of coughs every now and then, ive been reading alot about chicken and duck diseases and such recently and now have become a little parnoid about my duck trio getting sick.. the coughing is not constant, only now and again, she seems perfectly happy and healthy otherwise.. as they are currently molting and preening a fair bit i assumed she may have swallowed a feather or something .. sort of like when a cat has a furr ball? I just wonder if it could be something serious or contagious? Im reasonably new to ducks so i just want to be sure, & get as much info as possible. My three ducks (1 female 2 male) are approx 4months old, i got them from a family friend who hatched eggs from their pet backyard pair, they do not leave my backyard, they do not have contact with other ducks or chickens, and i do not intend on breeding them or eating them, they are strickly pets! I will be moving soon and just want to be reassured they are ok to move, and i wont be putting them or anyone else at risk... i feel paranoid... am i being paranoid?