One summer day, while grazing in a field, he was captivated by the delightful music of the grasshopper. 'What is it that you eat that allows you to give off a sound like that?' he asked one of them.
'Dew,' answered the grasshopper, joking.
'That's what I need,' thought the donkey. So he went on eating grass with great enthusiasm for the rest of his life, especially at dawn, when it was covered with dew. His voice never changed, but luckily, nature had bestowed on him a healthy appetite.