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In this Dec. 15, 2014 photo, Ricardo Alegria leads his donkeys past a public bus as he searches for customers to sell fresh milk in Santiago, Chile. Ricardo Alegria is a different sort of milk man. For a quarter century or more, he and his brother Marco have led donkeys through the streets of ChileÌs capital, milking them on the spot for customers. (AP Photo/Luis Hidalgo) ( Chile Donkey Milk Photo Essay )

In this Dec. 15, 2014 photo, Marco Alegria milks his donkey for a paying customer in the street in Santiago, Chile. The use of donkeyís milk has persisted in some parts of the world. Even Pope Francis has said he drank it as a boy in Argentina, prompting an Italian company that produces the milk to give him two donkeys recently. (AP Photo/Luis Hidalgo) ( Chile Donkey Milk Photo Essay )

In this Dec. 15, 2014 photo, a man stops to drink fresh donkey milk in the street in Santiago, Chile. The use of donkeyÌs milk has persisted in some parts of the world. Even Pope Francis has said he drank it as a boy in Argentina, prompting an Italian company that produces the milk to give him two donkeys recently. (AP Photo/Luis Hidalgo) ( Chile Donkey Milk Photo Essay )

In this Dec. 13, 2914, Ricardo Alegria walks his donkeys past a watermelon stand as he works to sell their fresh milk in Santiago, Chile. Ricardo Alegria said the milk is taken as a vitamin jolt for babies with gastric problems, and researchers at the University of Camerino in Italy have reported it can be a good substitute for children with allergies to cow's milk. But adults too often drink it. (AP Photo/Luis Hidalgo) ( Chile Donkey Milk Photo Essay )

In this Dec. 13, 2014 photo, people stop for a snack where brothers Marco and Ricardo Alegria sell their donkeys' milk on the sidewalk in Santiago, Chile. The Alegrias sell shot-sized cups of the milk for about $2. A half-liter, the most they say a donkey produces in a day, goes for about $20. (AP Photo/Luis Hidalgo) ( Chile Donkey Milk Photo Essay )

In this Dec. 13, 2014 photo, Ricardo Alegria feeds a watermelon peel to one of his donkeys as he waits for customers to sell fresh donkey milk in Santiago, Chile. ItÌs a rare job, but a very old one. The ancient Greek physician Hippocrates recommended donkeyÌs milk for some ailments and at least some claim that Cleopatra bathed in it for her skin. (AP Photo/Luis Hidalgo) ( Chile Donkey Milk Photo Essay )

In this Dec. 13, 2014 photo, Ricardo Alegria holds his donkeys by a leash as he yells to sell their milk in the streets of Santiago, Chile. Alegria, along with his brother Marco, has been selling fresh donkey milk for the past 25 years, and says it's recommended as a vitamin boost. Shot glass size cups of the drink sell for about $2 dollars. Half a liter, which is the most he says his donkeys can give in one day, sells for about $20 dollars. (AP Photo/Luis Hidalgo) ( Chile Donkey Milk Photo Essay )

In this Dec. 13, 2014 photo, Marco Alegria hands a customer a small cup of fresh donkey milk as the customer hands him money in the streets of Santiago, Chile. Selling donkey milk is a rare job, but a very old one. The ancient Greek physician Hippocrates recommended donkey's milk for some ailments and at least some claim that Cleopatra bathed in it for her skin. (AP Photo/Luis Hidalgo) ( Chile Donkey Milk Photo Essay )

In this Dec. 15, 2014 photo, a toddler is given fresh donkey milk from his mother in Santiago, Chile. The vendor, Ricardo Alegria, said the milk is taken as a vitamin jolt for babies with gastric problems, and researchers at the University of Camerino in Italy have reported it can be a good substitute for children with allergies to cow's milk. (AP Photo/Luis Hidalgo) ( Chile Donkey Milk Photo Essay )

In this Dec. 15, 2014 photo, Marco Alegria leads his donkeys along a street, selling their milk on the spot for paying customers in Santiago, Chile, Monday, Dec. 15, 2014. Alegria is a different sort of milk man. For a quarter century or more, he and his brother Ricardo have led donkeys through the streets of Chileís capital, milking them on the spot for customers. (AP Photo / Luis Hidalgo) ( Chile Donkey Milk Photo Essay )