This will show you what I am talking about as far as swim time something similar.
https://www.backyardchickens.com/threads/pellets-for-ducklings.1338597/page-11
https://www.backyardchickens.com/threads/pellets-for-ducklings.1338597/page-11
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I can't believe I don't have a better picture and one that really shows the cardboard but this is a folding dog pen fence I got at Walmart for about $35 which you really don't need. In the 2nd picture the ducks are too big to fit through the holes in the fencing but before that,Pics please @DuckyDonna