Flying squirrel /(? [or] ?)/

Fly·ing squir·rel

Flying squirrel
  1. One of a group of squirrels, of the genera Pteromus and Sciuropterus [Outdated], having parachute-like folds of skin extending from the fore to the hind legs, which enable them to make very long, gliding leaps. (Zool.) [Outdated]