Feces

Your body uses food to grow.

Some food is not used. It leaves your body as poo.

This can help plants grow. It can even be used as fuel. Some animals eat it too. Young elephants eat their mother's poo. This helps them stay healthy.

Many creatures find it useful. It is a busy part of nature.

Feces are the solid remains of food. They come from parts that the body did not digest.

In the large intestine, bacteria break these remains down. This process makes feces leave the body through the anus or a cloaca.

Feces are very useful in nature. They can be used as fertilizer to help plants grow. Some people even burn dried animal dung for fuel.

Many animals eat feces to get energy or health. This is called coprophagia. For example, young elephants eat their mother's feces. This helps them get good bacteria for their gut.

Scientists also study very old feces. These are called coprolites. They are fossilized remains. They show scientists what animals ate long ago. Some feces can even hold DNA. This helps us learn about ancient life.

Even insects like the Cyclosia papilionaris moth feed on bird droppings. In nature, everything is recycled.

Feces are the solid or semi-solid remains of food. They come from parts of food that the small intestine did not digest. In the large intestine, bacteria break these remains down further. This material also contains waste products and dead cells from the gut lining. These materials leave the body through the anus or a cloaca. This act is called defecation.

How does this happen? The body uses muscular contractions to move the material. A build-up of gases inside the gut also helps. These forces create pressure to push the feces out. In humans, this pressure can reach 13.3 kPa. In penguins, the pressure can reach 60 kPa. The distinctive smell comes from things like skatole and sulfur compounds.

Scientists have studied these remains for a long time. In 1829, William Buckland first described coprolites. These are fossilized feces. Before he named them, people called them "fossil fir cones." Coprolites are very important for paleontologists. They provide direct evidence of what extinct animals ate. They can range from a few millimeters to over 60 centimeters in size.

Feces play a huge role in the world around us. They can be used as fertilizer or soil conditioner in farming. Some people even burn dried dung from cattle or bison as fuel. Even some animals eat feces to stay healthy. This is called coprophagia. Young elephants eat their mothers' feces to get helpful gut bacteria.

Nature uses this material to recycle energy. Many organisms, called detritivores, eat dead organic matter. This helps move nutrients back into the soil for plants. This movement is part of the biogeochemical cycle. Some animals, like frugivores, eat fruit and spread seeds through their feces. This helps new plants grow far away from the parent.

Feces are the solid or semi-solid remains of food that a body cannot digest. This material is left over after the small intestine has finished its work. In the large intestine, bacteria break these remains down even further. Feces also contain metabolic waste products, such as bilirubin that has been changed by bacteria. They also contain dead epithelial cells, which are cells from the lining of the gut. Together with urine, these materials are known as excreta.

The process of removing feces is called defecation. This happens when material is discharged through the anus or a cloaca. To move the material out, the body must create pressure. This pressure comes from muscular contractions and a build-up of gases inside the gut. When the pressure is high enough, it prompts the sphincter to release the feces. In humans, this pressure can reach 13.3 kPa. In penguins, the pressure is much higher, reaching 60 kPa.

Feces have a very distinctive smell. This odor is caused by several different compounds. One is skatole, which is produced from tryptophan via indoleacetic acid. Other contributors include thiols, which are sulfur-containing compounds, as well as amines and carboxylic acids. One specific molecule involved is hydrogen sulfide.

Scientists have hypothesized that this bad odor acts as a deterrent. It may help prevent humans from touching or consuming it, which could cause sickness or infection.

In nature, feces play a vital role in the biogeochemical cycle. This is the process of recycling organic matter back into simpler forms. Many organisms, known as detritivores, survive by eating this dead organic matter. While feces contain less energy than the original food, they often still hold about 50% of that energy. This provides a massive energy source for decomposers like fungi and bacteria. Some animals even practice coprophagia, which is eating feces to gain nutrients. For example, young elephants eat their mothers' feces to get essential gut flora.

Feces also help plants spread across the world. Frugivores are animals that eat fruit. When these animals eat fruit, they may swallow the seeds. If the seeds can survive the journey through the digestive system, they are eventually released in feces. This is a successful way for plants to disperse seeds far away from the parent plant. Being far away helps the seeds avoid heavy predation. Additionally, the feces provide a built-in fertilizer for the new plant to grow.

Humans have used feces for many different purposes throughout history. In agriculture, animal feces like manure or guano are used as fertilizer. In some countries, dried dung from animals like bison or cattle is burned as fuel. Even more unusual uses exist, such as making coffee. Kopi luwak is made from beans eaten and excreted by Asian palm civets. Black Ivory coffee is made using coffee beans digested by elephants. In Thailand, even paper is manufactured from elephant dung.

Scientists also study ancient feces to learn about the past. A coprolite is a piece of fossilized feces. These were first described by William Buckland in 1829. Before that, people called them "fossil fir cones." Coprolites are important because they provide direct evidence of what extinct animals ate. They can be as small as a few millimeters or over 60 centimeters long. Researchers also study palaeofeces, which are ancient feces found in archaeological sites. By analyzing seeds, bones, or even ancient DNA, they can learn about the diet and health of ancient people.