This nomadic species reaches the Pribilof during major irruption years. Decades can go between sightings, but as the summer of 2003 showed, occasional influxes can bring many individuals to the island. In 2003 scattered individuals, including small flocks of up to seven birds were found throughout the summer. 2003 also was a banner year for siskins on Saint Lawrence Island. Pribilof records span from late May through mid September. Siskins seem to feed on rye grass, wild celery and possibly Nootka Lupine seeds, and seem able to subsist on this diet for a protracted period of time. Often the best clue to this species presence is their characteristic zipper-like contact calls.