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Benefits and uses

Dung beetles play a role in agriculture and tropical forests. By burying and consuming dung, they improve nutrient recycling and soil structure. Dung beetles have been further shown to improve soil conditions and plant growth on rehabilitated coal mines in South Africa. They are also important for the dispersal of seeds present in animals' dung, influencing seed burial and seedling recruitment in tropical forests. They can protect livestock, such as cattle, by removing the dung which, if left, could provide habitat for pests such as flies. Therefore, many countries have introduced the creatures for the benefit of animal husbandry. The American Institute of Biological Sciences reports that dung beetles save the United States cattle industry an estimated US$ 380 million annually through burying above-ground livestock feces.

In Australia, the Commonwealth Scientific and Industrial Research Organisation (CSIRO) commissioned the Australian Dung Beetle Project (1965–1985) which, led by George Bornemissza, sought to introduce species of dung beetles from South Africa and Europe. The successful introduction of 23 species was made, most notably Digitonthophagus gazella and Euoniticellus intermedius, which has resulted in improvement of the quality and fertility of Australian cattle pastures, along with a reduction in the population of pestilent Australian bush flies by around 90%. In 1995 it was reported that dung beetles were being trialled in the Sydney beach suburb of Curl Curl to deal with dog droppings.

An application has been made by Landcare Research to import up to 11 species of dung beetle into New Zealand. As well as improving pasture soils the Dung Beetle Release Strategy Group say that it would result in a reduction in emissions of nitrous oxide (a greenhouse gas) from agriculture. There is, however, strong opposition from some at the University of Auckland, and a few others, based on the risks of the dung beetles acting as vectors of disease. There are public health researchers at the University of Auckland who agree with the current EPA risk assessment and there are several Landcare programmes in Australia that involve schoolchildren collecting dung beetles.

The African dung beetle (D. gazella) was introduced in several locations in North and South America and has been spreading its distribution to other regions by natural dispersal and accidental transportation, and is now probably naturalized in most countries between México and Argentina. The exotic species might be useful for controlling diseases of livestock in commercial areas, and might displace native species in modified landscapes; however, data is not conclusive about its effect on native species in natural environments and further monitoring is required.

Like many other insects, (dried) dung beetle, called qiāngláng (蜣蜋) in Chinese, is used in Chinese herbal medicine. It is recorded in the "Insect section" (蟲部) of the Compendium of Materia Medica, where it is recommended for the cure of 10 diseases.

In Isan, Northeastern Thailand, the local people eat many different kinds of insects, including the dung beetle. There is an Isan song กุดจี่หายไปใหน "Where Did the Dung Beetle Go", which relates the replacement of water buffalo with the "metal" buffalo, which does not provide the dung needed for the dung beetle and has led to the increasing rarity of the dung beetle in the agricultural region.

The Mediterranean dung beetle (Bubas bison) has been used in conjunction with biochar stock fodder to reduce emissions of nitrous oxide and carbon dioxide, which are both greenhouse gases. The beetles work the biochar-enriched dung into the soil without the use of machines.

Scientists in Canberra in 1965 discovered that Dung beetles (Scarabaeids), specifically Onthophagus australis Guérin-Méneville, improve plant yields using their dung. Japanese millet was studied and data on nutrient uptake. These plants were placed in pots lacking nitrogen, phosphorus, and sulfur. Cow-dung was then added in treatment groups with or without O. australis. Some treatment groups even had two out of the three nutrients supplemented in the pots. Comparisons of the treatment and control groups were made to show that top growth and roots significantly increased when the dung was mixed well into the soil in the pots. Results showed that dung beetle activity greatly improved plant life. The dung has little impact alone, but in combination with the dung beetle, the nutritional value for the plants increases greatly. This suggests that dung beetles have many positive implications for the environment, including a beneficial role with plant life.