it seems here in almost the whole season all the puddlers will respond to a mallard call..especially GWT..even some divers will respond to it..but one of my favorite calls is the buck gardner 6-in-1 whistle..it is deadly on almost all the ducks..especially mallards and black ducks..plus you can use it as a pintail,woodduck,wigeon,mallard,etc....it's by far one of my favorites

p.s.-i highly recommend this call(buck gardner 6-in-1 whistle) or the haydels whistle is another good one...this call should definately go on the lanyard..and if the ducks won't respond to the mallard call...try this call...plus i got the buck gardner whistle for 8 dollars from wal-mart and it came with a "fowlmouth" double reed duck call