Siberian flying squirrel

The Siberian flying squirrel (Pteromys volans) is an Old World flying squirrel ranging from the Baltic Sea in the west, throughout Northern Asia to the coast of the Pacific Ocean in the east. It is the only species of flying squirrel in Europe and is considered vulnerable in the European Union where it occurs only in Estonia and Finland.[2] In Latvia, it was last sighted in 2001 and has been considered to be locally extinct since 2013.[3]

Siberian flying squirrel
next to nesthole
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Order: Rodentia
Family: Sciuridae
Genus: Pteromys
Species:
P. volans
Binomial name
Pteromys volans
Subspecies
  • P. v. volans
  • P. v. athene
  • P. v. buechneri
  • P. v. orii
Siberian flying squirrel range
Synonyms

Sciurus volans Linnaeus, 1758

Description

A female Siberian flying squirrel weighs about 150 grams, the males being slightly smaller on average. The body is 13–20 cm long, with a 9–14 cm long flattened tail. The eyes are large and strikingly black. The coat is grey all over, the abdomen being slightly lighter than the back, with a black stripe between the neck and the forelimb. A distinctive feature of flying squirrels is the furry glide membrane or patagium, a flap of skin that stretches between the front and rear legs. By spreading this membrane the flying squirrel may glide from tree to tree across distances of over a hundred metres, and have been known to record a glide ratio of 3.31, but is normally 1-1.5.[4]

Behaviour

Diet

Its diet consists of leaves, seeds, cones, buds, sprouts, nuts, berries and occasionally bird eggs and nestlings. When alder and birch catkins are plentiful, the squirrel may store them for the winter in old woodpecker holes or similar nooks.

Siberian flying squirrel in the forest

Reproduction

They mate early in the spring. In southern Finland the first mating season begins in late March, with a second mating season occurring in April. After a gestation period of five weeks, the female gives birth to a litter of usually two or three young, each weighing about 5 grams.[5] They preferentially build their nest in holes made by woodpeckers, but they may also nest in birdhouses if the size of the entrance is appropriate. The nest consists of a pile of soft materials (preferably soft beard lichen) into which the squirrel burrows. They can live up to about five years.

Habitat
Feces of Siberian flying squirrel.

They favour old forests with a mix of conifers and deciduous trees. They are mostly nocturnal, being most active late in the evening, although females with young may also feed during the day. They do not hibernate, but in the winter they may sometimes sleep continuously for several days. As shy and nocturnal animals, they are seldom seen. The most common sign of their presence is their droppings, which resemble orange-yellow rice grains and are often found beneath or on top of their nest.

Predators

The squirrels are preyed upon by martens, hawks, owls, dogs and cats.

In human culture

It is the emblem of Nuuksio National Park in Espoo municipality of Finland due to the density of the population in this region.[6]

In Estonia, the Siberian flying squirrel is depicted on the logo of the Estonian Nature Fund.[7]

Threats
The Siberian flying squirrel photographed in Klaukkala, Finland, at night in 2006.

In Finland and especially the Baltic states, the Siberian flying squirrel has been at risk potentially becoming an endangered species. P. volans is already extirpated from Lithuania. Since 1996, it was also considered extinct in Belarus, until being spotted again in 2017, with more than 80 habitats subsequently discovered in far northern regions of the country in 2019.[8] Acts that are believed to be contributors to the decrease in the population size are habitat fragmentation, climate, and habitat loss in places they reside like boreal forests and old-spruce-dominated forests.[9] Because Finland is a member of the European Union, the squirrel is under the protection of the EU's 1992 Habitats Directive. The EU, Finland and Estonia have responded with a six-year, 8.9 million euro project to help protect the squirrel.[10]

References
  1. Shar, S.; Lkhagvasuren, D.; Henttonen, H.; Maran, T. & Hanski, I. (2017) [errata version of 2016 assessment]. "Pteromys volans". IUCN Red List of Threatened Species. 2016: e.T18702A115144995. doi:10.2305/IUCN.UK.2016-3.RLTS.T18702A22270935.en. Retrieved 17 February 2022.
  2. "Pteromys volans (Linnaeus, 1758)". www.gbif.org. Retrieved 2023-05-19.
  3. Ikauniece, S. "Lidvāveres atstājušas Latviju". Dabas aizsardzības pārvalde (in Latvian). Retrieved 6 January 2023.
  4. Asari, Yushin; Yanagawa, Hisashi; Oshida, Tatsuo (2007). "Gliding ability of the Siberian flying squirrel Pteromys volans orii". Mammal Study. 32 (4): 151–154. doi:10.3106/1348-6160(2007)32[151:GAOTSF]2.0.CO;2.
  5. Nowak, Ronald (1999). Walker's Mammals of the World. Johns Hopkins University Press. ISBN 978-0-8018-5789-8.
  6. "The Flying Squirrel in Nuuksio National Park". Retrieved 31 Oct 2019.
  7. Estonian Nature Fund – Flying squirrel (in English)
  8. "Flying squirrel". Дзікая прырода побач (in Russian). 2020-06-30. Retrieved 2023-01-16.
  9. Koskimäki, Jane; Huitu, Otso; Kotiaho, Janne S.; Lampila, Satu; Mäkelä, Antero; Sulkava, Risto; Mönkkönen, Mikko (2013). "Are habitat loss, predation risk and climate related to the drastic decline in a Siberian flying squirrel population? A 15-year study". Population Ecology. 56 (2): 341–348. doi:10.1007/s10144-013-0411-4. S2CID 15765204.
  10. Roberts, W. S. (2022-01-10). "A forest of contradictions: Protecting the Siberian flying squirrel". The Independent. Retrieved 2022-03-22.
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