While there are a number of brands of this kind of decoy – and we're not pushing any one brand over another – most duck hunters have adopted the term “mojo” to refer to just about any motion decoy. ... However, a lot of duck hunters have found that mojos really do improve the chances of ducks landing in their spreads.
Are motion decoys worth it?
Spinning-wing decoys seem to pay benefits when hunting mallards on big water or, especially, in fields. In fact, I think spinners are crucial to field-hunting success, though you want to use models with remote-controlled on-off switches, which let you stop the spinning wings as ducks get close.
Do mojos scare ducks?
i use a baby mojo and it is the trick for drawing in birds from a distance. I will never hunt without one again. give it a shot, some birds love it, very few are afraid of it.