Igor Shpilenok / Crooked branches of the Ermans birch tree {Betula ermanii} Kronotsky Zapovednik, Kamchatka, Far East Russia
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Igor Shpilenok / Stone / Ermans birch {Betula ermanii} in snow, Kronotsky Zapovednik, Kamchatka, Far East Russia
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Igor Shpilenok / Stone / Ermans birch tree {Betula ermanii} growing on slopes of the upper forest belt, Kronotsky Zapovednik Reserve, Russia.
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Igor Shpilenok / Erman Birch tree grove {Betula ermanii} in Golovnino Volcano caldera, Kurilsky, Russia.
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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.
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Tony Wu / Siberian flying squirrel (Pteromys volans orii) consuming male catkins from Erman's birch tree (Betula ermanii). Hokkaido, Japan. February.
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Tony Wu / Siberian flying squirrel (Pteromys volans orii) consuming male catkins from Erman's birch tree (Betula ermanii). Hokkaido, Japan. February.
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Tony Wu / Siberian flying squirrel (Pteromys volans orii) eating male catkin from Erman's birch tree (Betula ermanii) on snowy day. Hokkaido, Japan. February.
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Tony Wu / Siberian flying squirrel (Pteromys volans orii) eating male catkins of Erman's birch tree (Betula ermanii). Hokkaido, Japan. February.
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Tony Wu / Siberian flying squirrel (Pteromys volans orii) plucking out and consuming male catkins of Erman's birch (Betula ermanii) from stashed food in unused bird's nest. Unusual behaviour. Hokkaido...
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Tony Wu / Female Siberian flying squirrel (Pteromys volans orii) consuming small branches of Erman's birch tree (Betula ermanii) that it has brought back to nest as takeaway meal. Hokkaido, Japan. February...
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Tony Wu / Siberian flying squirrel (Pteromys volans orii) making its final approach back to nest, a narrow crack in Erman's birch (Betula ermanii) tree, Hokkaido, Japan. March.
