Runner ducks for pasture maintenance. Their job is to clean the pastures of the parasites that could make the goats or cattle sick.
Rouen ducks are great for egg and for meat production, and are also used for pasture maintenance. Rouen ducks look a lot like the mallard duck, however the rouen duck is bigger in size and doesn't fly.
Muscovy ducks, also known as the (turkey duck). The Muscovy is used for its amazing meat, tasting almost like a very tender roast beef.
Guinea fowl, The guinea fowl is good for insect control, including ticks. They are also for meat.