As you can see in nature, the squirrel hierarchy breaks down the ranking system of the squirrels. Squirrels thrive on organization and structure. All young squirrels must start as worker squirrels and move their way up to sentry squirrels and so on. The bottom two ranks are considered squirrel boot camp.

While many lazy squirrels may spend their entire lifetime at the lowest rank of 'Worker Squirrel' wasting their stupid lives gathering food for their superiors, building squirrel bunkers and barracks, and stockpiling acorns for projectile assaults on humans, other squirrels have more ambition. They might work hard and move up through the ranks, so high that they might become 'Elites', providing protection for the most decadent of squirrel authority figures.