Transcript
4 panel comic, split into two parts.
Part 1: Introverts
Panel 1: [A purple clam sits happily on a rock at low tide. Some seaweed and pebbles are strewn about] Clam: No
Panel 2: Clam: I will NOT open up.
Part 2: Extroverts
Panel 3: [A cartoony otter stares downwards]
Panel 4: [The otter raises a rock above his head]


That might have been a comment more about OTTERS specifically than extroverts. They are, after all, carnivores; the males are also inter-species rapist necrophiles.