Northern Flying Squirrel (Glaucomys sabrinus) -

Northern flying squirrels live in coniferous forests across Canada, Alaska, and the mountains of the northern United States. They are strictly nocturnal, coming out at night to forage for fungi like mushrooms and truffles. The most striking feature of these arboreal rodents is their skin flap known as a patagium that stretches between their hind and forelimbs. They use this membrane like a glider to soar short distances between trees. This method of aerial locomotion is very efficient for getting between trees, but comes at the cost of clumsy movement on the ground. They live inside small tree hollows, in which they huddle together to stay warm during the winter.