This is a male Japanese dwarf flying squirrel (Pteromys volans orii). This sub-species of Siberian flying squirrel, found only in Hokkaido, Japan and known locally as ezo-momonga, is primarily nocturnal. This imdividual was active during the day because it was competing for the attention of a female in oestrous. The squirrel paused for a moment to groom himself.
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