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Im sure it's been asked before, but please just humour me.
 One of our ducks stopped laying about 3 weeks ago. Then after about a week and a half she started to lay away, (hiding her eggs under bushes and such like). Now I know that is what ducks do normally in the wild, but she always layed hers very early in the morning, as when we let her out first thing, there was normally a egg waiting for us, and it was usually cold. now she lays away and they are shell less just like egg shaped rubber balls. Now this evening i've just found one on the lawn which is semi hard. It's not shell less like a rubber ball, but you can press it just about and leave an indentation, any more pressure and it will crack.
All the rest of the ducks are laying fine and they are getting plenty of grit any ideas.

[Kate and her Ducks]

Sounds odd. Pics might help.

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Anyone make head or tail of this?  Strange :blink:

[Kate and her Ducks]

Looks just like the soft eggs one of mine lays. She's having all the stuff, oyster shell, limestone flour, cod liver oil and she still lays them so think it is just the way she is. Doesn't seem to bother her. Have had the odd one from the others last year but that resolved with the above treatments.