Coprophagia

Coprophagy refers to many kinds of feces-eating, including eating feces of other species (heterospecifics), of other individuals (allocoprophagy), or one's own (autocoprophagy).

[2] In humans, coprophagia has been described since the late 19th century in individuals with mental illnesses and in some sexual acts,[3] such as the practices of anilingus and felching where sex partners insert their tongue into each other's anus and ingest biologically significant amounts of feces.

[5] Several beverages are made using the feces of animals, including but not limited to Kopi luwak, insect tea, and Black Ivory Coffee.

in Thailand routinely ate the feces and dead skin of their leader, whom they considered to be a holy man with healing powers.

reported "... consumption of fresh, warm camel feces has been recommended by Bedouins as a remedy for bacterial dysentery; its efficacy (probably attributable to the antibiotic subtilisin from Bacillus subtilis) was anecdotally confirmed by German soldiers in Africa during World War II".

These feces contain substantial amounts of semidigested food, particularly in the case of herbivores, owing to the inefficiency of the large animals' digestive systems.

[22] Lagomorphs (rabbits, hares, pikas) and some other mammals ferment fiber in their cecums, which is then expelled as cecotropes and eaten from the anus, a process called "cecotrophy".

Some dogs may lack critical digestive enzymes when they are only eating processed dried foods, so they gain these from consuming fecal matter.

The U.S. Food and Drug Administration regulates this practice by attempting to prevent the introduction of any part of cattle brain or spinal cord into livestock feed.

[26] The young of elephants, giant pandas, koalas, and hippos eat the feces of their mothers or other animals in the herd, to obtain the bacteria required to properly digest vegetation found in their ecosystems.