looks like the duck isnt the only thing wonderin .... lol ..... man every bird is different .... best thing to do is get out there and see how the birds react .... ya will notice each flock is different .... and sum days they will pour into ya spread ...others they wont .... just set it out .... if the birds tend to flare, land wide of the spread, etc .... pull it up and work the next flock ... just experiment a lil ..... good luck and let us know how ya do