The Japanese Giant flying squirrel is not confined to heavily forested areas; its various habitats include forests, hills, and mountains. There are four recognized subspecies of this squirrel. Comparisons of Petaurista, a flying squirrel, with these tree squirrels provided only a limited context for gliding because of different methods used in the 2 studies. Materials and Methods Petaurista leucogenys was studied at Nara Park, Nara Prefecture, Japan (135°50′E, 34°41′N) from 12 May 1999 to 15 June 1999. The Bhutan giant flying squirrel (Petaurista nobilis), also known as the gray's giant flying squirrel or noble giant flying squirrel, is a species of rodent in the family Sciuridae. The Japanese giant flying squirrel, Petaurista leucogenys Temminck, is endemic to three islands of Japan: Honshu, Shikoku, and Kyushu (Corbet & Hill, 1991; Abe et al., 2005).This species is nocturnal, arboreal (Baba, Doi & Ono, 1982; Ando, Funakoshi & Shiraishi, 1983; Nowak, 1991), and successfully adapted to temperate mixed deciduous forest and evergreen broadleaved forest (Nowak, 1991). It prefers tropical and temperate climates. The Japanese Giant flying squirrel is found in southern Asia and Japan.