Ok, so a little background here. What kind of ducks, how old are they, what are you feeding them? Has there been a predator attack?
I gave more info on water situation in other replies but to answer the rest. 3 drakes (2 pekin, 1 black swedish) almost 4 months old. And 4 female (2 blue, 1 black swedish and 1 appleyard) not certain on age. Was told they were 4-5 months getting them 2 months ago but in my best opinion seem to be the same age as my boys.
No laying or breeding behavior yet, not really expecting anything until spring given them being late hatch and us being in WI.
I was feeding sprout all flock as well as fresh produce, corn and mealworms as treats. Switched to Nutrena NatureWise all flock a little over a week ago.
We did have a fox kill our favorite of the 4 drakes a few days after they were transitioned to fully outside, also the 2nd day we had the girls, 1st that they were outside cooped seperate but able to see eachother. The fox attacked 3 more times after however I was able to quickly intervene and none were hurt. We finally got it trapped and killed a few weeks ago and they have been happily free ranging since until 2 days ago. We, our neighbors and our dog have not saw or heard any other predators in the area in the past few weeks. I also checked in, under, all around the coop/run for entry attempt, nest, poop, track there was nothing and my dog also didnt smell anything. I'm honestly stumped! I'm thankful I got then out today and they were content enough to nap in the yard, but the main concern is water which still has not been touched in any of the 3 containers or the massive backyard puddle that they normally love.