Usually the story is that Medusa was an Athena priestess, who once made love to Poseidon in Athena's temple. In revenge Athena turned Medusa into something as ugly as possible.
Another Answer:
Because she was making love in a temple that belonged to Athena and in rage Athena turned Medusa's hair into snakes, or Medusa bragged about her hair and Hera, out of jealousy, turned her hair into snakes. Whatever makes sense to you.
Yet Another Answer:
Medusa once informed Athena that Snakes were more Fair(more beautiful) than Athena herself in order to spite her. In a fit of rage Athena damned Medusa to become that which she held so high.
Yes, Medusa did have snakes for her hair!!! EEEW!!
The Greek myth of medusa stated that her hair was only made of snakes and not hair.
Athena turned Medusa's hair into snakes because Poseidon slept with Medusa inside Athena's temple.
Medusa has snakes on her head in place of hair.
Well, Medusa's hair was different kinds of snakes.
She had strange hair with snakes as hair.
Snakes for hair
No. Athena caught Posideon and Medusa (who at the time was his girlfriend) in her temple, which was very disrespectful to her, and set her hair as snakes.
No, that was Athena.
Medusa. not Savannah :P
Athena the goddess
The only enemy I know that Medusa has is Athena. She turned her hair into snakes.