Flying squirrel

Flying squirrels are a tribe of 44 species in the squirrel family Sciuridae.^[2] Despite the name, none use powered flight: all are gliders.

Flying squirrel Temporal range: Early Oligocene – Recent
Northern flying squirrel (Glaucomys sabrinus)
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Class:	Mammalia
Order:	Rodentia
Family:	Sciuridae
Subfamily:	Sciurinae
Tribe:	Pteromyini Brandt, 1855
Genera
Aeretes Aeromys Belomys Biswamoyopterus Eoglaucomys Eupetaurus Glaucomys Hylopetes Neopetes[1] Iomys Petaurillus Petaurista Petinomys Pteromys Pteromyscus Trogopterus

A flying squirrel gliding

They are sociable, noisy rodents that glide from tree to tree, using a flap of loose skin that connects their front and hind legs. They can glide up to 150 feet (46 m), steering with their tail, and landing on tree trunks, gripping it with all four feet.

These squirrels are nocturnal (most active at night). They have a life span of about five years in the wild, and about 13 years in captivity. Flying squirrels live in forests in North America, Europe and Asia.

Flying squirrels eat mostly plants, like seeds, nuts, leaves, maple sap, bulbs, bark, flowers, and roots. Less often, they eat insects, eggs, worms, small birds, and other small animals.

Flying squirrels are hunted by weasels, foxes, hawks, and coyotes.

Evolution

Before the 21st century, the evolutionary history of the flying squirrel was often debated.^[3] This debate was clarified by two recent molecular studies.^[4][5] These studies found that the living flying squirrels originated 18–20 million years ago, are monophyletic, and have a sister relationship with tree squirrels.

There are reasons which may explain why gliding has evolved in mammals: ^[6]

1. economical locomotion: moving between trees using as little energy as possible.
2. finding food: economical searching.
3. avoiding predators.
4. reducing landing forces as compared to simple jumping.