The goats in Morocco climb a particular tree to eat its fruit. The nut they excrete can be turned into oil. Gathering these nuts has been another source of income for farmers there, but the risk of overgrazing and overcollection has been mounting. Areas are being set aside as biopreserves and cooperatives are trying to keep goats off so the fruit can fall "naturally" [the goats seem pretty natural to me] in the hopes that Westerners might be more willing to rub the oil on their faces or put it on their food if it hasn't passed through a goat's digestive system first.
Find more here as item 3. Another hat tip to Newmark's Door.