Trivia: Which of these monsters did Heracles encounter during his 12 labors?
Correct Answer: Hydra
So why is this answer correct? : The Hydra is an imposing, snake-like creature with multiple heads (often nine), one of which is immortal. As soon as any of these heads were cut off, two more grew in its place. Mythological hero Heracles (also referred to as Hercules) successfully slew the Hydra with the help of his nephew Iolaus and buried the creature’s remaining immortal head under a rock.