stringer
n.— «Twitchathons, which are held across the country in spring, rely on the honesty of competitors, and perhaps the fear of the ultimate birdwatching shame—being labelled a “stringer,” the term for those suspected of lying about bird sightings.» —“Twitchers’ weekend on the cheep” by Lorna Edwards The Age (Melbourne, Australia) Nov. 7, 2005. (source: Double-Tongued Dictionary)