The Japanese giant flying squirrel (ムササビ, musasabi, Petaurista leucogenys) is a species of flying squirrel, one of the giant flying squirrels in the genus Petaurista.

This article relies largely or entirely on a single source. (June 2013)

Quick Facts Conservation status, Scientific classification ...

Japanese giant flying squirrel
Conservation status
Least Concern  (IUCN 3.1)[1]
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Class:	Mammalia
Order:	Rodentia
Family:	Sciuridae
Genus:	Petaurista
Species:	P. leucogenys
Binomial name
Petaurista leucogenys Temminck, 1827
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Like other flying squirrels, it has a web of skin between its legs which it uses to glide between trees. Glides of 160 metres have been recorded. The tail is used for stability during flight. The body is about 25–50 cm long, and the tail a further 30–40 cm. It weighs between 700 and 1500g. It is much larger than the related Japanese dwarf flying squirrel which does not exceed 220g. It eats fruit and nuts and lives in holes in large trees. The female has a home range of about a hectare and the male about two hectares.

It is native to Japan, where it inhabits sub-alpine forests and boreal evergreen forests on the islands of Honshu, Shikoku and Kyushu.

Sexual maturity is reached after about two years.^[2] From winter to early summer the males compete for females. During mating, after ejaculation, the male produces a sticky protein called a coitus plug from his penis which becomes firm and blocks the female's vagina. This may stop semen from leaking out and heighten the chances of fertilization. It also prevents other males from mating with the same female. However males can use their penis to remove the coitus plug. Gestation lasts about 74 days and one or two young are born in early autumn.^[3]