But on the dairy side of the spectrum, there's an unusual milk that is the most expensive in the world -- and it doesn't come from a cow, a sheep, or a goat. This scarce and valuable product comes ...

From a melon that costs thousands to truffles sniffed out by trained pigs, these are the most expensive foods in the world.

The world’s most expensive cow has been taken to auction ... Viatina-19 belongs to the Nelore breed, which is raised for meat, not milk, and makes up most of Brazil’s stock.

Narrator: Pule donkey cheese is the most expensive ... We've tried to milk them by machine, but that has turned out to be impossible. Because a donkey is not made like a cow, to give milk, only ...

Although more expensive than cow's milk, camel milk is far richer in vitamin ... Camels also produce less methane – which New Scientist calls the "most significant" contributor to climate ...