 Most of the calls used by this quail are present after five weeks of development; however, they remain relatively changeable until sexual maturity is reached.The typical crow of the Japanese quail is characterized by two short parts that precede a final, major trill.Crowing of males has been observed to expedite the development of the female's gonads as those exposed to such crowing reach maturity much earlier that those who are not exposed to male vocalizations.