Kopi Luwak kopi luwak type process occurring naturally with muntjac and birds. Bat coffee is another variation that is in demand. Bats feed on the ripest coffee and fruits and spit out the seeds. These seeds are dried and processed to make coffee with a slight fruity flavor. Kopi Luwak Kopi luwak (), or civet coffee, is coffee that includes partially digested coffee cherries, eaten and defecated by the Asian palm civet ("Paradoxurus hermaphroditus"). Fermentation occurs as the cherries pass through a civet's intestines, and after being defecated with other fecal matter, they are collected. Producers of the coffee beans argue that
Metabolic waste excreta. Some mammals including humans excrete uric acid as a component of their urine but it is only a small amount. These compounds form during the catabolism of carbohydrates and lipids in condensation reactions, and in some other metabolic reactions of the amino acids. Oxygen is produced by plants and some bacteria in photosynthesis, while CO is a waste product of all animals and plants. Nitrogen gases are produced by denitrifying bacteria and as a waste product, and bacteria for decaying yield ammonia, as do most invertebrates and vertebrates. Water is the only liquid waste from animals and photosynthesizing plants.