Aristotle’s ‘political animal’ (zoon politikon) is not the creature we might expect today – a conventional construct enfranchised by legal edict and duty-bound only to his own individual happiness as a free agent in a democratic nation-state. Instead, what Aristotle had in mind was an animal that was best suited to realize his complete end or natural goal (his telos) in a community organized to that end as well. That community is known as a city-state (a polis). As an integrated part of a functional polis, man is a creature of the polis – a political animal.
Wherein I speculate as to the possible libertarian implications of Aristotle's Ethics, and compare it to Plato's Republic (very briefly). It's a sketch.