A report on Feces and Bilirubin

Skatole is the principal compound responsible for the unpleasant smell of feces.
Heme metabolism
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.

Feces contain a relatively small amount of metabolic waste products such as bacterially altered bilirubin, and dead epithelial cells from the lining of the gut.

- Feces

For example, the molecules excreted in the urine differ from those in the feces.

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

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Bile (yellow material) in a liver biopsy stained with hematoxylin-eosin in a condition called cholestasis (setting of bile stasis).

Bile

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Dark-green-to-yellowish-brown fluid produced by the liver of most vertebrates that aids the digestion of lipids in the small intestine.

Dark-green-to-yellowish-brown fluid produced by the liver of most vertebrates that aids the digestion of lipids in the small intestine.

Bile (yellow material) in a liver biopsy stained with hematoxylin-eosin in a condition called cholestasis (setting of bile stasis).
Action of bile salts in digestion
Recycling of the bile
Cholic acid
Chenodeoxycholic acid
Glycocholic acid
Taurocholic acid
Deoxycholic acid
Lithocholic acid

The composition of hepatic bile is (97–98)% water, 0.7% bile salts, 0.2% bilirubin, 0.51% fats (cholesterol, fatty acids, and lecithin), and 200 meq/l inorganic salts.

In the absence of bile, fats become indigestible and are instead excreted in feces, a condition called steatorrhea.