A report on Feces and Anus

Skatole is the principal compound responsible for the unpleasant smell of feces.
Formation of anus in proto- and deuterostomes
The molecule hydrogen sulfide contributes to the smell of feces.
A pet waste station in Tucker, Georgia
Cyclosia papilionaris consuming bird droppings
Horse feces
Sign ordering owners to clean up after pets, Houston, Texas, 2011
Bear scat
Bear scat showing consumption of bin bags
The cassowary disperses plant seeds via its feces
Earthworm feces aids in provision of minerals and plant nutrients in an accessible form
Feces from different seabirds.

Its function is to control the expulsion of feces, the residual semi-solid waste that remains after food digestion, which, depending on the type of animal, includes: matter which the animal cannot digest, such as bones; food material after the nutrients have been extracted, for example cellulose or lignin; ingested matter which would be toxic if it remained in the digestive tract; and dead or excess gut bacteria and other endosymbionts.

- Anus

Feces are discharged through the anus or cloaca during defecation.

- Feces
Skatole is the principal compound responsible for the unpleasant smell of feces.

2 related topics with Alpha

Overall
Human anatomy of the anorecturm (anus and rectum)

Defecation

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Human anatomy of the anorecturm (anus and rectum)
The caganer is a defecating figurine in Spanish nativity scenes

Defecation (or defaecation) follows digestion, and is a necessary process by which organisms eliminate a solid, semisolid, or liquid waste material known as feces from the digestive tract via the anus.

Diagrams to illustrate the changes in the cloaca in mammals during development. A, early embryonic stage, showing the cloaca receiving the urinary bladder, the rectum, and the Wolffian duct, as in non-therian vertebrates. B, later stage, showing the beginning of the fold which divides the cloaca into a ventral urogenital sinus which receives the urinary bladder, Wolffian ducts, and ureters, and into a dorsal part which receives the rectum. C, further progress of the fold, dividing the cloaca into urogenital sinus and rectum; the ureter has separated from the Wolffian duct and is shifting anteriorly. D, completion of the fold, showing complete separation of the cloaca into ventral urogenital sinus and dorsal rectum.

Cloaca

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Posterior orifice that serves as the only opening for the digestive, reproductive, and urinary tracts (if present) of many vertebrate animals.

Posterior orifice that serves as the only opening for the digestive, reproductive, and urinary tracts (if present) of many vertebrate animals.

Diagrams to illustrate the changes in the cloaca in mammals during development. A, early embryonic stage, showing the cloaca receiving the urinary bladder, the rectum, and the Wolffian duct, as in non-therian vertebrates. B, later stage, showing the beginning of the fold which divides the cloaca into a ventral urogenital sinus which receives the urinary bladder, Wolffian ducts, and ureters, and into a dorsal part which receives the rectum. C, further progress of the fold, dividing the cloaca into urogenital sinus and rectum; the ureter has separated from the Wolffian duct and is shifting anteriorly. D, completion of the fold, showing complete separation of the cloaca into ventral urogenital sinus and dorsal rectum.
Cloaca of a female bird
Cloaca of a male bird
A roseate spoonbill excreting urine in flight
Cloacal opening in an Australian brushtail possum
Some aquatic turtle species can breathe underwater using a process known as cloacal respiration. In this process the turtles pump water into their cloacal orifice (labeled 1) by contracting muscles in their inguinal pocket. The water then travels to the cloacal bursae (labeled 2), which are a pair of internal pouch-like structures. The cloacal bursae are lined with long fimbriae (labeled 3), which is the site of gas exchange.
Cloaca of a Red-tailed hawk

All amphibians, reptiles, birds, and a few mammals (monotremes, tenrecs, golden moles, and marsupial moles) have this orifice, from which they excrete both urine and feces; this is in contrast to most placental mammals, which have two or three separate orifices for evacuation.

Even in the marsupials that have one, the cloaca is partially subdivided into separate regions for the anus and urethra.