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Manure is the term used to refer to the droppings or feces of plant-eating mammals (herbivores). Their droppings consist of large amounts of partially digested plant material broken down into small fragments. As the bacteria in their digestive systems are largely harmless to humans, manure is often used for fertilizer.
Manure has been used for centuries as a fertilizer for farming, as it is rich in nitrogen and other nutrients which facilitate the growth of plants. Liquid manure from hog operations is usually knifed(injected) directly into the soil to reduce the unpleasant odors. Manure from cattle is spread on fields using a spreader. Due to the lack of proteins in grasses, which herbivores eat, it has a much milder smell than that of carnivores - for example, elephant dung is practically odorless.
The dried manure of animals has also been used as fuel throughout history. For example, dried manure of camels and other animals (usually known as dung) was an important fuel source in deserts where wood was scarce. It was used for many purposes, in cooking fires and to combat the cold desert nights.