Easy to grow and makes a beautiful ground cover, strawberries are an excellent addition to any edible landscape or homestead for a reliable fruit that propagates easily and without any additional work on your part. Since they also grow close to the ground, they are easily accessible to the ducks so you'll never have to pick strawberries if you don't want to.
Of course, if you are fond of strawberries, you can wall off a section for yourself and let the ducks have the rest. The thick canopy of the strawberry leaves also makes an excellent place for worms, slugs, and other grubs to hide, giving the ducks some readily available protein, which, depending on your grow zone, might be year round, as strawberry plants do not always go dormant for the winter.
I have also found that strawberry plants that grow around the duck pond have their leaves gnawed on by ducks swimming around looking for additional greenage. An additional benefit of having strawberries growing by the pond is they help to soften the pond edge and give the ducks access to more food while on the pond, which is super useful if you are gleying or patching holes in your leaking pond using ducks
When growing strawberry bushes somewhere where the ducks can yank them up...like on the side of the pond where erosion can be an issue, ducks may also eat the roots of the strawberries. I haven't found this to be an issue though as my Indian Runner Ducks only seem to eat the strawberries hanging on by a thread to the edges of the duck pond, which, I hope to have properly filled by summer. I have not seen any evidence thus far of strawberries being able to be grown as bog or marsh plants in the very wet area that will form around the pond as it ages and as the pond water level rises.