 While there are benefits and challenges with using this method of tracking, it is one of the only practical means of tracking small birds over long distances during migration.Passive integrated transponders (PIT) are another method of telemetry used to track the movements of a species Passive integrated transponders, or "PIT tags", are electronic tags that allow researchers to collect data from a specimen without the need to recapture and handle the animal.Data is captured and monitored via electronic interrogation antennae, which records the time and location of the individual.