So, last year we started our farm off with mostly muscovy ducks. We have geese, chickens, and turkies too. However, we are mostly having a problem with our muscovies. Since last year they have mixed with our other ducks (and most are quite adorable), however two days ago four of them fell sick(when I say sick, I mean laying down not really moving, labored breathing, and lulling their head around like they just don't have any energy) and died less than 24 hrs from finding them. The free rangers are the only ones getting sick, but it's just the muscovy mixbreeds. Our chickens, turkies, and geese are all fine. We haven't done anything different that would make them sick. Any ideas what it could be? Again, it's only been the muscovy mixbreeds. None of our other poultry have been sick.