Step 1 : Introduction to the question "What animal produces the world's most expensive cheese?"
...A single pound of pule cheese will set you back a staggering $600. Why? Pule is crafted from the milk of Balkan donkeys, which are found exclusively in Serbia and Montenegro. This elite donkey herd must produce an astonishing 25 liters of milk to yield just one kilo (a bit over 2 pounds) of pule. The scarcity of resources combined with the extensive time required for production has crowned it the most expensive cheese in the world. The next most expensive cheese is White Stilton Gold, an English cheese priced at $400 per pound and real gold into its recipe.