I hunt in new york on big lakes and small swamps.i use about 4 species in my spread. We have 1 1/2 dozen mallards, 1 dozen divers, 1dozen BLACK DUCKS And about 5 pintails. We put the divers on a line outside of the puddlers. the pintails should go on the edge of the mallards and the black ducks should go inside mallards in groups of 3 or 4. I also use geese floaters and i put the black ducks with them. Im not sure about some places but in new york you should definently have black duck decoys in your spread. we have shot bluebills, bufflehead, goldeneye, mergansers, pintails, teal, wigeon, mallards, black ducks, and a few shovelers from this spread.