This species possesses a tracheo-bronchial syrinx, which creates two sources of vibrations so it can produce two frequencies at the same time with multiple harmonics. The laughing kookaburras call is made through a complex sound production system, by forcing air from the lungs into the bronchial tubes. While the structure for producing calls is present from an early age, the kookaburra’s song is a learned behavior. The breeding pair within a riot of kookaburra teach the fledglings to produce the signature laughing call after the young have left the nest. The adult male will sing a short portion of the call while the offspring mimics this call, usually unsuccessfully. The singing lessons tend to last two weeks before the fledgling can properly sing and take part in crepuscular choral songs. Once mastered, the young can join in crepuscular chorus songs that aid in establishing territory.