Clean, wipe and dry the ducks. Sprinkle generously with flour, salt and pepper. Place whole peeled onion inside each duck and place them in self basting roaster. Fasten with toothpicks. Place 2 or 3 strips of bacon across each bird. If desired, ducks may be stuffed with wild rice dressing made by boiling wild rice and seasoning with salt, pepper and chopped onions. Cover bottom of roaster with water. Cover tightly and roast in oven at 350 degrees for 1 1/2 hours to 2 hours, depending on the number and size of ducks. Remove cover of roaster for last 15 to 20 minutes before taking from oven to allow skin to brown.