I've been reading about gapeworm because one of my ducks has partly lost her voice and sometimes sounds like a squeaky toy, shes been coughing as well though, I am keeping an eye on her but so far she hasn't developed any of the other symptoms and tell tell signs attached to gapeworm. We don't have any de-worming products for ducks in the UK so people usually use chicken or geese products but they don't always work so is often a case of hit or miss - Just thinking if it might be worth your while to de-worm your flock any way? Vets here recommend de-worming chickens twice a year regardless so I'm thinking it wouldn't do them any harm?