This species,who sings ket-ket-shi in reedbeds at the beginning of summer with its mouthwide open, is sometimes called ggyo-gyo-shihin Japanese. The firstrecognition of this species in the Asakawa River basin every year is betweenmid-April and the beginning of May. Since the bird stops singing andretreats to thickets after the breeding season, the time for leaving herefor the south is not defined; however, we presume the time for migration tothe south is from the latter half of September to the first half of October,based on our observation recorded on October 6.
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