I have had two ducks die so far this winter, about 2 weeks apart. One died suddenly with no symptoms, thought maybe it was the cold that did her in. The second duck became very suddenly ill. Her underside was covered in a pasty mint green waste. She was shaking her head and spewing a green liquid. I noticed this at 7am, had her to the vets at 10:30. She could not stand and she could not retract her wings, they just drooped. She ended up passing away shortly after we got to the vets. She was sent out for a necropsy. Results came back with only more questions. They said possible Newcastle, AI, sarcocystis, or bacterial infection. They wanted more money to test for those 4 things. It has been almost a week and all of the other birds seem completely fine. Has anyone had this happen? The tests are quite expensive...vet has not called me back. Not sure where to go from here. If there are no other deaths, is it safe to add to my flock in the spring?