The long call is used when the group is spread out over distances greater than ten meters or in response to a neighboring group.[1] The pygmy marmoset uses the trill for short-distance communication, J-calls for intermediate distances, and long calls for long distances; these have respectively decreasing frequencies. Pigmy marmosets interpret these calls not only by type but also, through subtle sonic variance, by individual calling. Research based on audio playback tests shows that calls recorded from different individuals in captivity varied significantly in all seven auditory parameters analyzed for each type of call.