Do All Squirrels Fly?

Do All Squirrels Fly? Do all squirrels fly? Northern flying squirrels (Glaucomys sabrinus) and southern flying squirrels (Glaucomys volans) are the only two native flying squirrel species found in North America. What is the difference between a squirrel and a flying squirrel? Flying squirrels are typically much smaller at about 8-12 inches in length and