Changing Heads

This is a poster I purchased during our visit to Australia earlier this year. The title is Challenging Heads (Yallaroo). The text at the bottom reads:

"In the beginning the Sun God created the tortoise with a short neck and poisonous fangs but being very slow, when the tortoise left the water to breathe, he was easy prey.The Sun God made made the snake very fast but without  any weapons to protect himself. The Sun Goddess took pity on the unhappy creatures her husband had created and swapped the poisonous head of the tortoise  with the long thin neck of the snake. Now the tortoise could breathe safely without leaving the water and the snake no longer had to run and hide."