Abstract
In this study, determination of the distribution of the crested myna (Acridotheres cristatellus), an introduced bird species in Japan, was attempted in Shikoku district. Observations of the crested myna were collected through interviews, documents, and several web-based search engines. Currently, there is no information indicating naturalization of this species outside Kagawa Prefecture. In the 2000s, the distribution of the crested myna expanded to the central and western regions of the prefecture. Since 2010, the species has been expanding to the eastern region. There are only two records of crested myna sightings in Ehime Prefecture and no records in Tokushima Prefecture. Additionally, there is no information of certain habitation in Kochi Prefecture.
