Northern Flying Squirrel

Northern Flying Squirrel

Kingdom
Phylum
Subphylum
Class
Order
Family
Tribe
Genus
SPECIES
Glaucomys sabrinus
Population size
Unknown
Life Span
4-13 yrs
WEIGHT
75-140 g
LENGTH
25-37 cm

The Northern flying squirrel is a North American rodent with long whiskers and a flattened tail. As a matter of fact, this mammal doesn't fly, but glides, using the fold of skin, found between its wrists and ankles. When gliding, this crease of skin extends, allowing the animal to 'fly', whereas the tails acts as a rudder. The Northern flying squirrel is a nocturnal creature that lives in forested areas. It has brown fur on the upper-parts, which fades to buffy-white on the belly.

Distibution

Endemic to North America, the northern flying squirrel is widely distributed throughout much of the continent form from Alaska, eastwards to Canada and the eastern provinces, southwards to interior regions of the United States, reaching southern California. Preferred habitat of this species is area with abundance of conifer trees. This rodent occurs in large numbers in deciduous and mixed coniferous/deciduous forests. Other suitable habitats include: areas, dominated by spruce, fir and mixed hemlocks; beech maple forests; areas with abundant growth of white spruce and birch, alternating with aspen groves.

Geography

Continents

Climate zones

Habits and Lifestyle

Northern flying squirrels often form groups of 8 individuals, typically including matures squirrels and juveniles. In addition, multiple individuals have been known to live in the same nest. During the winter months, these squirrels gather into same-sex units in order to keep warm. Northern flying squirrels are strictly nocturnal animals. They have two periods of activity during the day: one occurs an hour after sunset, lasting around 2 hours, whereas the other begins 2 hours before sunrise, lasting for 1.5 - 2 hours. During the year, each individual may have several dens. The winter dens of this species are usually cavities in conifer trees. Since, they don't hibernate, multiple individuals may live in a single den during this period to conserve heat. These rodents are one of the most aerodynamically sophisticated gliding mammals. They are able to glide for as long as 5 - 45 meters at a time (20 average), though flights as long as 90 meters have been recorded. Northern flying squirrels are terrestrial feeders, spending a lot of time looking for food. Primary forms of communication include vocalizations, scent and touch. The most commonly heard calls of this squirrel are soft, low chirping sound and a cluck, which is emitted when the animal is feels danger.

Diet and Nutrition

The Northern flying squirrel is granivore and mycophage, it generally feed upon nuts, acorns, fungi and lichens. They are also known to consume fruits, buds, sap, insects and eggs of various birds.

Mating Habits

REPRODUCTION SEASON
March-May
PREGNANCY DURATION
37-42 days
BABY CARRYING
2-4 kittens
INDEPENDENT AGE
3 months
FEMALE NAME
doe
MALE NAME
buck
BABY NAME
pup, kit, kitten

Currently, there is very little information on the reproductive system of this species. They most likely have different mates during each breeding season, which means they may exhibit either polygynous (one male mates with multiple females) or polygynandrous (promiscuous) (both males and females have multiple mates) mating systems. They mate from March to late May. Gestation period lasts for 37 - 42 days, yielding 1 - 6 young with an average of 2 - 4 per year. Males usually don't participate in rearing the offspring. The babies are born undeveloped with closed eyes and ear, fused toes as well as a cylindrical tail. They are extremely tiny and weigh only 5 - 6 grams at birth. Their fused toes separate by the 6th day of their lives, while the eyes open after 31 days old. At about 40 days old, young squirrels leave the nest. Complete weaning occurs after 2 months of age, by they often continue living for their mother until 3 months old. They are ready to produce offspring during the summer following their birth.

Population

Population threats

Being widely distributed and quite common throughout its range, this squirrel is not currently threatened. However, in 1985, the U.S. Fish and Wildlife Service classified the Northern flying squirrel as Endangered due to sharp population decline as a result of habitat loss, caused by forest clearing and recreational activities. In addition, population in the Appalachians has suffered from introduction of non-native species.

Population number

According to IUCN, the Northern flying squirrel is common and widespread throughout its range but no overall population estimate is available. Today, this species’ numbers are stable and it is classified as Least Concern (LC) on the IUCN Red List.

Fun Facts for Kids

  • When gliding, these rodents may perform full semi-circles during a single ‘flight’.
  • These squirrels use a wide variety of vocalizations, including sharp squeaking calls, soft 'chirps', chuckling noises, “churring”, “whining” as well as various musical whistles.
  • Inspired by the gliding habits of flying squirrels, humans have made a special suit that imitates this rodent and is used by base jumpers and skydivers, allowing to slow their descent and perform different maneuvers while flying.
  • During a glide, these agile rodents are able to male turns of up to 180 degrees. The longest known 'flight' of the Northern flying squirrel was as long as 300 feet, although this animal rarely travels such long distances.
  • While most squirrels break a nut shell to get to the meat, the Northern flying squirrels usually dig a hole that allows them to reach the desired meat.

References

1. Northern Flying Squirrel Wikipedia article - https://en.wikipedia.org/wiki/Northern_flying_squirrel
2. Northern Flying Squirrel on The IUCN Red List site - http://www.iucnredlist.org/details/39553/0

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