Carolina Northern Flying Squirrel

The Carolina Northern Flying Squirrel (Glaucomys sabrinus coloratus) is a small gliding mammal that is one of 25 subspecies of northern flying squirrels living in boreal coniferous and mixed coniferous/hardwood forests of the United States and Canada. The more common Southern Flying Squirrel (Glaucomys volans) also lives in the southern Appalachian Mountains but is typically found in hardwood and mixed pine-hardwood forests at lower elevations. The northern flying squirrel is distinguished from the southern flying squirrel by its larger size and the gray base of its belly hairs as opposed to a white base in the southern species. 

 The Carolina northern flying squirrel can trace its roots back to the last ice age. During this time, ice sheets covered much of northern North America, forcing cold-climate plants and animals further south. As temperatures warmed and ice sheets receded, those cold-climate species migrated north, and some found refuge on the high, cold peaks of the southern Appalachians. Over thousands of years, these isolated, mountain-top populations became increasingly distinct, giving rise to the Carolina northern flying squirrel, a subspecies of northern flying squirrel only found in the high-elevation areas of North Carolina, Tennessee, and southwest Virginia. 

Historically, Carolina northern flying squirrel habitat was dramatically altered and decfreased by industrial scale logging and subsequent forest fires in southern Appalachia around the turn of the 20th century. Today, much, though not all, of its habitat is on land dedicated to conservation (e.g. National Forests, National Park Service units), however the high-elevation forests on which the squirrel face threats that function independent of political or ownership boundaries. The balsam woolly adelgid continues to threaten Fraser fir trees, and the hemlock adelgid is now threatening Eastern and Carolina hemlocks. Beech bark disease is killing large numbers of American beech trees, an important northern hardwood species that provides nesting habitat for the Carolina northern flying squirrel. Acid precipitation and other environmental pollution continue to be a concern. Additionally, climate change climate change
Climate change includes both global warming driven by human-induced emissions of greenhouse gases and the resulting large-scale shifts in weather patterns. Though there have been previous periods of climatic change, since the mid-20th century humans have had an unprecedented impact on Earth's climate system and caused change on a global scale.

Learn more about climate change has the potential to exacerbate these threats and add additional stressors to high-elevation forests in the Southern Appalachians. To address some of these issues, biologists are working to restore or introduce red spruce to some areas to offset the loss of conifer species.