Good advice Zubba.

I can relate what Zubba is saying directly to waterfowl as well. Its a common teaching cliche (though a correct one), to tell audiences at seminars that as long as the ducks (or turkeys.. or deer), are coming your way, there is NOTHING that can make the situation any better than it already is. The game is yours to lose. You can always call again if they start to veer away or seem to lose interest. Calls do not really draw in ducks or turkeys (decoys do that), what calls do on birds and deer is to make them curious... their own natural curiosity is what will lead them to their demise.