The nocturnal glider that helps forests breathe through fungi
In short: The northern flying squirrel is more than just a nimble acrobat of the North American taiga. By consuming specific underground fungi, these nocturnal rodents act as essential ecological engineers, facilitating a vital mutualistic relationship between trees and the soil that sustains entire forest ecosystems.
The northern flying squirrel (Glaucomys sabrinus) plays a critical role in forest health by consuming the underground fruiting bodies, or sporocarps, of fungi. These fungi form mutualistic relationships with trees by colonizing their roots. By feeding on these fungi, the squirrels facilitate the dispersal of the fungi, providing a significant ecological benefit to the trees and the broader forest structure. This interaction is particularly significant in the North American taiga. The squirrels specifically target underground fruiting bodies to find their food. This behavior ensures the survival of the fungi's symbiotic connection to the trees.
Unlike many other squirrels that are active during the day, the northern flying squirrel is strictly nocturnal. Spanning from Alaska to Utah's peaks and the North Carolina highlands, this species thrives within North American mixed and coniferous woodlands. These rodents are proficient gliders but are notably uncoordinated when walking on the ground. These mammals are characterized by their light brown or cinnamon upper bodies and greyish flanks. They possess large eyes and long whiskers, which are common traits for nocturnal life. Their flat tails are also a distinctive physical feature.
Their diet is diverse, consisting of plant materials, tree sap, fungi, insects, and even carrion or bird eggs. This varied diet, combined with their movement through the canopy, makes them key players in nutrient cycling. While they are often valued for their thick fur or aesthetic presence, their primary value lies in these hidden mechanisms of forest maintenance. They are known to nest in cavities lined with lichen or other soft materials. During the winter months, several individuals might huddle together in a single shared nest. They generally breed only once every year.
Research into small mammal biodiversity highlights the challenges of monitoring such species. While community science platforms like iNaturalist are useful for abundant, easily identifiable species, they may underrepresent rare or cryptic mammals. For researchers, combining multiple community sources is necessary to build a robust dataset of these forest inhabitants. The study of these mammals in Ontario, Canada, occurred between May and August 2025. Researchers found that community outreach did not significantly increase iNaturalist submissions for their focal species. They also noted a lack of photographic evidence for rare small-mammal species.
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Sources
- Summary by Intellect · source: Northern flying squirrel | rodent | Britannica
- Also: Northern flying squirrel
- Also: Community Science: Big Insights From Small Mammal Data.
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