Cow dung

Cow dung on the ground
Drying cow dung for fuel
Water buffalo dung drying on the wall of a house in Yuanyang County, Yunnan, China
A mound of cow dung in India

Cow dung, also known as cow pats, cow pies, cow poop or cow manure, is the waste product (faeces) of bovine animal species. These species include domestic cattle ("cows"), bison ("buffalo"), yak, and water buffalo. Cow dung is the undigested residue of plant matter which has passed through the animal's gut. The resultant faecal matter is rich in minerals. Color ranges from greenish to blackish, often darkening soon after exposure to air.