Genuine Indonesian kopi luwak is collected from the droppings of a wild cat-like animal called the luwak (the common palm civet, Paraxorus Hermaphroditus), a shy, solitary nocturnal forest animal that freely prowls nearby coffee plantations at night in the harvest season, eating the choicest ripe coffee cherries. It can't digest the stones – or coffee beans – of the cherry, so craps them out along with the rest of its droppings. The beans are collected by farm workers. Cleaned and washed, they have acquired a unique and highly prized taste from their passage through the luwak's digestive tract and the anal scent glands they use for marking their territory. Being wild, hard to collect, variable in age and quality, and very rare, kopi luwak is not a commercially viable crop, but just an interesting coffee curiosity

http://www.theguardian.com/lifeandstyle/wordofmouth/2013/sep/13/civet-coffee-cut-the-crap