\Fly"ing squir"rel\ (? or ?). (Zo["o]l.)
One of a group of squirrels, of the genera {Pteromus} and
{Sciuropterus}, having parachute-like folds of skin extending
from the fore to the hind legs, which enable them to make
very long leaps.
Note: The species of Pteromys are large, with bushy tails,
      and inhabit southern Asia and the East Indies; those of
      Sciuropterus are smaller, with flat tails, and inhabit
      the northern parts of Europe, Asia, and America. The
      American species {(Sciuropterus volucella)} is also
      called Assapan. The Australian flying squrrels, or
      flying phalangers, are marsupials. See {Flying
      phalanger} (above).