This species is endemic to Japan. It is common, widespread and increasing in recent years, although a few populations in Tohoku District are threatened (Ministry of the Environment, 2007). Population density is usually larger in broad-leaved evergreen forests than in broad-leaved deciduous forests (Abe 2005). On Yaku Island, a survey conducted in 1991 and 1992 (Yoshihiro et al. 1998) estimated 131 troops containing 2,000-3,850 individuals in a coastal area of 12.7 km².
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