NAXOS ISLAND | Cave of Mt. Zas
Riddle Name: Stubborn Mule
"If you climb to the peak of Mount Zas, you will see two smaller islands to the south. I can only be found on one of the islands in a pile of hay near a friendly donkey. Make a decision - the last traveler starved to death trying to choose between the two!"
The Ainigmata is at the end of the cave below the statue.