Muscovy Ducks are said to be descendant of Geese and Wood Ducks, and the Drakes (the males) weigh in at about 12-15 pounds. If You know anything about Geese, or Muscovy Ducks, you probably know that because of their size, they create about a pound and a half to two pounds of manure a day! So, the eight we just put out to pasture, on our future garden plot, will deposit about 12-16 pounds of natural fertilizer, quality organic fertilizer, a day! The NPK of which is about 2-4-2.