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The Grey Starling Sturnus cineraceus roosts communally in Japan. In the eastern Kanto, Grey Starlings occupy large-numbered summer roosts between June and October. Although the existence of summer roosts had been reported, the distribution pattern of summer roosts over a large area was not known. We located 14 summer roosts in the eastern Kanto and analyzed their distribution pattern using the Iδ index. Our analysis revealed that they were uniformly distributed. All of the summer roosts in our study area were occupied from late June or early July to mid-October. The Grey Starling did not seem to favor a particular vegetation type to roost during summer, which was contrasting to their preference for bamboos in winter. Since several factors are involved in the occupation and abandonment of summer roosts, it is difficult to determine the very factor directly influencing them. The uniform distribution of summer roosts might be related to the life history of the Grey Starling, and might be convenient for the starlings accompanying inexperienced young to feeding grounds.

Distribution Pattern and Characteristics of Grey Starling Sturnus cineraceus Summer Roosts in the Eastern Kanto Area