What is killing my ducks. I had 21 ducks, 5 years to 1 year old. This morning i lost my 4th duck with in 4 weeks. First one died about 4 weeks ago, the 2nd died one week after the first. The third duck died 5 days ago and the fourth died last night. What diseases might be attacking my flock? The duck that died last night seem to be a little weak kind of droopy when she walked for the past two days. She ate but separated herself from the rest of the flock. Two nights ago I found her in the run and had to pick her up and put her in the coop. The ducks that died are only Ancona. I have never had any of my ducks just die like that. What might it be.