This is the third. There are no vets in my area who treat ducks, so that's not an option. She's very hoarse, slightly droopy wings, lethargic, but still has a great appetite. Greenish poop on her hiney. I've wormed her with ivermectin. The last one, I did some ivermectin and then some coccidia meds. He eventually got sick enough that we put him out of his misery. His organs all looked fine, and he had a belly full of grass and seeds (they get to free-range during the day), but he had NO muscle on him whatsoever. Any ideas? Obviously it's something contagious, but not horribly so because this started over 2 months ago. The others have all been fine, but one dies and then another gets sick. None of the chickens have been sick at all.