Tony Wu / Siberian flying squirrel (Pteromys volans orii) eating fresh needles of Sakhalin fir tree (Abies sachalinensis) during light snowfall. Hokkaido, Japan. February.
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Tony Wu / Female Siberian flying squirrel (Pteromys volans orii) feasting on branch cut from nearby Sakhalin fir tree (Abies sachalinensis). Hokkaido, Japan. February.
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Tony Wu / Portrait of Siberian flying squirrel (Pteromys volans orii) taken moments before launching from tree. Hokkaido, Japan. February.
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Tony Wu / Siberian flying squirrel (Pteromys volans orii)l gliding through forest. Hokkaido, Japan. February.
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Tony Wu / Siberian flying squirrel (Pteromys volans orii) gliding through forest in early morning. Hokkaido, Japan. February.
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Tony Wu / Siberian flying squirrel (Pteromys volans orii), usually nocturnal, gliding through forest. Diurnal activity like this is not common, probably adaptation to presence of pair of Ural owls. Hokkaido, Ja...
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Tony Wu / Siberian flying squirrel (Pteromys volans orii) often have favored locations for defecation. Hokkaido, Japan. February.
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Tony Wu / Siberian flying squirrel (Pteromys volans orii) peeking out of entrance of its nest prior to emerging to forage, surveying its surrounding. Hokkaido, Japan. February.
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Tony Wu / Siberian flying squirrel (Pteromys volans orii) consuming snow for moisture. Behavior taking place most often after foraging. Hokkaido, Japan. February.
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Tony Wu / Siberian flying squirrel (Pteromys volans orii) sitting in favorite spot during overcast winter morning. Hokkaido, Japan. February.
Tony Wu / Close-up view of Siberian flying squirrel (Pteromys volans orii) finishing eating meal of male catkins from Erman's birch tree (Betula ermanii). Hokkaido, Japan. February.