The Northern flying squirrel lives in the all parts of the canopy, however it is mostly found in the lower levels. It will nest in abandoned bird nests in hollowed out snags or on tree branches using moss, lichen, sticks, and soft plant fibers for nesting materials. In the Pacific Northwest, Northern flying squirrels mostly eat fungi and lichen. As a matter of fact, Flying squirrels play an important role in distributing the spores of truffles, which are a kind of fungi that help plants grow. Owl, weasel, martin, bobcat, wolf, hawk, lynx, and domestic cat hunt the Northern flying squirrel. The Northern flying squirrel is a primary food source for the Northern spotted owl.