The luwak, which is a cousin of the mongoose and can excrete an odor like a skunk's, is a small, mostly nocturnal animal. The luwak likes to eat coffee beans, and the coffee makers make sure it has plenty of beans to eat.
Many people feel that coffee that goes through this process would be absolutely disgusting, but fans of Kopi Luwak disagree. Studies have shown that because the luwak has already processed the beans, the makeup of the beans is changed and the coffee produced from them is less bitter.
Some skeptics worry about the safety of consuming something that has already been consumed by someone or something else. However, studies have shown that because the beans have already traveled through the luwak's digestive track, they may actually be cleaner than other coffee beans. And remember, they are roasted in addition to being cleaned.