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Decoys have been proven to be a great asset when starting a purple martin colony. Investigating Purple Martins will see these decoys and will greatly increase your chances of starting a colony.
Another advantage of having decoys is to lure hawks into attacking this seemingly off guard bird instead of the Purple Martins at your site.
Blow molded plastic decoy is life-sized and attaches to perching rods or house in several positions.
Using several decoys works even better.