I have this black and white duck. She made a nest in the bush near a lake, and laid one egg down in it. She left the egg though and came in to her coop like usual.
I think your duck is now afraid because of what happened to her previous eggs and will try to find a much more secluded area.
Sometimes you can 'watch' them to try and see where they are headed but they are smart and may just not go to their nest.
Hopefully, you can provide more security for her but most likely you're going to just have to be patient as if you keep hunting you may lead preditors to her nest.
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I need to move a nest with duck eggs in it. Where and how can I make new nest?