Konstantin Mikhailov / Japanese elm tree (Ulmus propinqua/ Ulmus davidiana var. japonica) dominant tree in Elm / Ash riparian forests of Ussuriland, SE Siberia, Russia

Tony Wu / Siberian flying squirrel (Pteromys volans orii) gliding back to its nest after foraging at the top of 20m tall Japanese elm trees (Ulmus davidiana var. japonica), carrying branch with fresh elm buds b...

Tony Wu / Siberian flying squirrel (Pteromys volans orii) inside nest has brought few sticks of Japanese elm (Ulmus davidiana var. japonica) back at end of foraging to enjoy before going inside. Sensing opportu...

Tony Wu / Siberian flying squirrel (Pteromys volans orii) carrying sticks of Japanese elm (Ulmus davidiana var. japonica) back to nest; enjoying eating one before entering nest. Hokkaido, Japan. February.

Tony Wu / Siberian flying squirrel (Pteromys volans orii) consuming fresh buds of small branch from Japanese elm tree (Ulmus davidiana var. japonica). Hokkaido, Japan. February.

Tony Wu / Siberian flying squirrel (Pteromys volans orii) consuming meal of Japanese elm buds (Ulmus davidiana var. japonica) while perched more than 20m above the ground. Hokkaido, Japan. February.

Tony Wu / Siberian flying squirrel (Pteromys volans orii) carrying small branch of Japanese elm (Ulmus davidiana var. japonica) back to its nest. This branch is take-away meal for enjoyment back home. Hokkaido,...

Tony Wu / Siberian flying squirrel (Pteromys volans orii) perched at top of twenty meter Japanese elm tree (Ulmus davidiana var. japonica) early in morning. Hokkaido, Japan. March.

Tony Wu / Japanese dwarf flying squirrel (Pteromys volans orii) feeding on leaf buds of a Japanese elm (Ulmus davidiana var. japonica) during winter, Hokkaido, Japan.

Tony Wu / Leaf buds of Japanese elm (Ulmus davidiana var. japonica), one of the favored foods of Japanese dwarf flying squirrels (Pteromys volans orii), Hokkaido, Japan.