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It can be a problem but the bigger ones are able to get away from the smaller ones more easily. Is that pic at your house?

Then khaki campbells. Good egg layers, a little bigger than your mallards but should do okay when grown.

Probably khaki campbells. I can't tell if they are brown or blue. If there is a noticable size difference between yours and these then you will need to insure that the younger ones don't get trampled.