The chorus symbolizes two distinct features of Greek society. First,
it represents the prevailing tide of public opinion. At first, the
chorus rejects Antigone's belief in divine justice over state
justice, but by the end of the play, especially after being advised by
Teiresias, the chorus changes positions and sides with Antigone.
Secondly, Sophocles uses the chorus to symbolize the consciences of
the characters. Sometimes the chorus seems to reveal the inner
thoughts of Creon; other times, it reveals Antigone's logic. Also,
the chorus is best able to state the views of the author, Sophocles.
Toward the end of the play, when the chorus attacks arrogance,
Sophocles himself comes very close to speaking to Athens, citing its
arrogance as cause for potential problems.
Teiresias cites the flesh-eating birds as signs that the gods' wrath
is upon Thebes. Sightings of ravens and other birds were deeply
significant in Greek culture; usually this was a sign from the gods,
often the foreshadowing of tragedy.