Years ago, in Ancient Greece lived a beautiful butterfly called Alila. Alila was Athena's pet and each day she would call Alila's name and regain her powers of changing coulur.
Until one day Alila did not come back. Athena was heart broken and looked down on earth to find Alila had been caught by a women who wanted to add her to her butterfly collection. Athena went down to earth and ordered to have her pet back.
But the women refused. Athena got so mad she turned her into a butterfly since she liked them so much and the women suddenly became a butterfly.
From this day on Athena kept her butterfly a secret and didn't send it to earth never again.
So now butterfly's stay in the sky so it's hard to be caught.