These small, long-eared, large-eyed tree squirrels are endemic to the Japanese Islands. They are specialists in natural mixed-species forests and pinewoods in subalpine areas, The amount of gray on the back and tail varies seasonally with more extensive gray during the winter as seen here. They are not particularly tolerant of humans and some populations have disappeared after forest fragmentation or local urbanization. Canon PowerShot SX60.
Reference:
Cassola, F. 2016. Sciurus lis (errata version published in 2017). The IUCN Red List of Threatened Species 2016: e.T20014A115155004. http://dx.doi.org/10.2305/IUCN.UK.2016-3.RLTS.T20014A22247065.en. Downloaded on 16 April 2019.
McLive, C. 2013. "Sciurus lis" (On-line), Animal Diversity Web. Accessed April 16, 2019 at https://animaldiversity.org/accounts/Sciurus_lis/