This is a large species, with a head and body length of about 43 cm and a tail of 50–52 cm. It has black to gray-brown fur, long and soft on the upper parts and somewhat shorter underneath the body, with a grizzled appearance. A wing membrane between the forelimb and hindlimb, paler coloured underneath, allows gliding between trees. The tail is hairy and blackish to gray-brown, the feet are black, and the nose is pale pink with black vibrissae.
The species is native to China, India, Laos, Myanmar, Sri Lanka, Thailand, and Vietnam. It inhabits dry deciduous and evergreen forest, usually at higher elevations from and has been recorded on plantations. Its taxonomy is very complex and not fully resolved. Up until the 1980s, some authorities even listed the Indian giant flying squirrel itself as a subspecies of the red giant flying squirrel. In 2005, Mammal Species of the World included grandis, yunanensis, hainana, nigra, rubicundus and rufipes in the Indian giant flying squirrel. Later studies have confirmed that all these are distinct and not closely related to the Indian giant flying squirrel; placing them together would result in a strongly polyphyletic "species". As a consequence, recent authorities have generally recognized them as part of the red giant flying squirrel or as their own species; the Formosan giant flying squirrel of Taiwan, Hainan giant flying squirrel of Hainan, and Yunnan giant flying squirrel in northeastern India, south-central China, Myanmar, northern Laos and northern Vietnam. The Formosan and Hainan giant flying squirrels have fully separate ranges, but the Yunnan giant flying squirrel is sympatric with the Indian giant flying squirrel.
Ecology
The Indian giant flying squirrel is nocturnal and arboreal, spending most of its life in the canopy. Nests are made in tree hollows lined with bark, fur, moss, and leaves. The species is sociable when food is abundant, but intraspecies attacks increase with food scarcity. Vocalizations are similar to those of the spot-bellied eagle-owl.
Diet
The species is mainly frugivorous, preferring the fruits of Ficus racemosa, followed by Cullenia and Artocarpus heterophyllus. It also takes bark, tree resins, shoots, leaves, insects, and larvae. Squirrels were shown to be somewhat tolerant of disturbance when foraging, and to exploit food resources at the forest edge, including exoticplanted species.
Reproduction
Female gives birth to a single offspring during mid June. Pups born blind, with a head that is disproportionately large when compared with the body.
