She can recite you a whole list of reasons you should have a duck. They will take care of all of your insects, they kill weeds, they don't kill anything good. They do not hurt grass, flowers, plants, or shrubbery. Ducks can withstand temperature ranges from something like 40 below zero to 120 degrees like we have here, with no outside shelter at all. Doesn't bother them.
Ducks carry no diseases.
None at all. They need no shots. They don't need medication. Chickens have to have shots and medication. But ducks don't.