And yet a nine-headed hydra must be easy compared to some of the monsters the Greeks came up with. Remember Typhon? He was one of the creatures who opposed Zeus when the gods overthrew the Titans. If I remember correctly, he had 100 heads, and some of his siblings had even more.
I wonder how the heads reached an agreement. Did they argue back and forth like the three-headed knight in "Monty Python and the Quest for the Holy Grail," was it a simple majority rules, or did each head control a different part of the body?
Then there was hundred-eyed Argus. I can only imagine the headaches he got with that many eyes. And can you imagine what would happen if he were cross-eyed or some of his eyes got glaucoma? His optometrist must have loved sending *him* bills.(I would wager he was available to watch Io for Hera because he never had a girlfriend. After all, would you want to date someone who poked you in the eye every time they hugged you?)