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The Siberian flying squirrel (Pteromys volans) is an Old World flying squirrel ranging from the Baltic Sea in the west, throughout Northern Asia to the coast of the Pacific Ocean in the east. A distinctive feature of flying squirrels is the furry glide membrane or patagium, a flap of skin that stretches between the front and rear legs. By spreading this membrane the flying squirrel may glide from tree to tree across distances of over a hundred metres.
Order: Rodentia > Family: Sciuridae > Genus: Pteromys > Species: Pteromys volans