Why would you want ducks?
Ducks are a very hardy bird. They seem to do well in all kinds of weather. They require less attention than a chicken. They don't forage as well as most geese, they do augment their diet by foraging, and lowering your feed bill.
Ducks need very little housing and do not require a pond or creek, but if you have one, they will be very happy birds!
They will rid your garden, yard or orchard of snails, earwigs, slugs or any other bug they can find. They will fertilize your soil and you can collect their flowers to make earrings, feather dream catchers, etc.
Ducks have personalities! They frolic on a pond, waddle mechanically in a line to some distant object. They make very good pets.
As an 8th grader, a friend and I did a science project involving 8 ducks. When the project was over, we found homes for 7... haha. It was my way of keeping the duck. I named him Dandelion for his yellow duckling down, but he turned out to be a very large white Pekin. I would fill a baby pool full of water, and sit outside with him as he splashed and cavorted around. He would follow behind me where ever I walked.
Some ducks are great for egg production, and some are good for meat production. There isn't a dual purpose duck. Duck eggs are wonderful for baking... a little larger than a chicken egg. They can also lay almost as many as a chicken!