Northern flying squirrel
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|Northern Flying Squirrel|
|Northern flying squirrel range
based on the IUCN distribution map.
The Northern flying squirrel (Glaucomys sabrinus) is one of two species of the genus Glaucomys, the only flying squirrels found in North America (the other is the somewhat smaller Southern flying squirrel, G. volans). Unlike most members of their family, flying squirrels are strictly nocturnal. The Northern flying squirrel is found in coniferous and mixed forests across the top of North America, from Alaska to Nova Scotia, south to the mountains of North Carolina and west to California. Populations from the Pacific Coast of the United States are genetically distinct from those of G. sabrinus found elsewhere in North America, although they are considered to belong to the same species. Two subspecies are found in the southern Appalachians, the Carolina Northern flying squirrel, G. s. coloratus, and the Virginia Northern flying squirrel G. s. fuscus, both of which are endangered, although the Virginia subspecies has recovered enough that it was delisted in August 2008. The U.S. Fish and Wildlife Service put the flying squirrel back under protection on June 6, 2011.
The nocturnal, arboreal rodents have thick light brown or cinnamon fur on their upper body and greyish on the flanks and whitish underneath. They have large eyes and a flat tail. They can also be identified by their long whiskers, common to nocturnal mammals. The adult northern flying squirrel measures from 25 to 37 cm long, and their weight can range from 110 to 230 grams.
Flying Squirrels do not actually fly, but rather glide using a membrane called a patagium created by a fold of skin which starts at the wrists of the forearms, extends along the sides of the body, and finishes at the ankles of the hind legs. From atop of trees, flying squirrels can initiate glides from a running start  or from a stationary position by bringing their limbs under the body, retracting their heads, and then propelling themselves off the tree.   It is believed that they use triangulation to estimate the distance of the landing area as they often lean out and pivot from side to side before jumping.  Once in the air, they form an "X" with their limbs by spreading their long arms forward and out and their long legs backward and out, causing their membrane to stretch into a square-like shape  and glide down at angles of 30 to 40 degrees. They maneuver with great efficiency in the air, making 90 degree turns around obstacles if needed. Just before reaching a tree, they raise their flattened tails which abruptly changes their trajectory upwards, and point all of their limbs forward to create a parachute effect with the membrane in order to reduce the shock of landing. The limbs absorb the remainder of the impact, and the squirrels immediately run to the other side of the trunk or to the top of the tree in order to avoid any potential predators. Although graceful in flight, they are very clumsy walkers and if they happen to be on the ground in the presence of danger, they will prefer to hide rather than attempt an escape. 
A major food source for the squirrels are mushrooms fungi (truffles) of various species, although they also eat lichens, mushrooms, all mast-crop nuts, tree sap, insects, carrion, bird eggs and nestlings, buds and flowers. The squirrels are able to locate truffles by olfaction, though they also seem to use cues such as the presence of coarse woody debris, indicating a decaying log, and spatial memory of locations where truffles were found in the past.
The northern flying squirrel is also known to cache food for when food supplies are lower. These caches can be in cavities in trees, as well as in the squirrels' nest. Lichens and seeds are commonly cached.
The northern flying squirrel also disseminates spores of the ectomycorrhizal fungi that they eat, and these are essential to many species of conifer and some deciduous trees.
The Northern flying squirrel generally nests in holes in trees, preferring large-diameter trunks and dead trees, and will also build outside leaf nests called dreys and will also nest underground. Tree cavities created by woodpeckers as suitable nest sites tend to be more abundant in old-growth forests, and so do the squirrels, though harvested forests can be managed in ways that are likely to increase squirrel numbers. Except when rearing young, the squirrels shift from nest to nest frequently. They often share nests during winter months, forming aggregations. Usually, aggregate nests contain 4 to 10 individuals. The sharing of nests in winter by northern flying squirrels is important in maintaining body temperature (biothermal regulation), as northern flying squirrels do not hibernate, nor do they enter torpor states.
Northern flying squirrel gliding distances tend to be between 5 and 25 metres, though glides of up to 45 m and longer have been observed. Average glides are about 5 m less for females than for males. Glide angle has been measured at 26.8 degrees and glide ratio at 1.98., width is 4 ft.
Since first documented by Shaw in 1801, the general understanding was that northern flying squirrels bred but once per year. Recently, in southern Ontario, Canada, polyestrus behaviour (two litters per year) has been documented for the first time. This observation has since been confirmed by a second research team in New Brunswick, Canada.
In southern Ontario, Canada, genetic evidence has recently shown that hybridization with the rapid northward expansion and increased sympatry of southern flying squirrels.
Northern flying squirrels, along with pine squirrels, are an important prey species for the Spotted Owl Strix occidentalis. Other predators include various other large birds, especially the Great Horned Owl, hawks, the American Marten, the Canadian Lynx the Red Fox, and the Domestic Cat.
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