Do Insects Pee? Myth-busting the Secret Life of Bugs

Have you ever wondered if insects pee or how they manage their waste, considering their tiny size? Bugs and insects are everywhere, including in our homes, gardens, and fields. They creep or fly around us, and sometimes we can’t avoid stepping on them, making us wonder about their intriguing biomimicry. If you’re curious about how insects live, how they eat, and how they poop and pee, this article is for you.

What’s in the waste that insects produce?

Like all animals, insects have to eliminate waste after consuming food. Insects release two types of waste from their bodies: poop and pee, but they combine the two while expelling them. Their poop is called frass, while their pee is called urine. Frass is a mix of undigested food, gut bacteria, and solid waste, while urine is mostly water, toxic nitrogen compounds, and salts.

Do insects pee like humans?

Even though insects release pee excrement, they do not have a urinary system like humans. Insects excrete all body waste through tiny openings on their sides called spiracles, which are sort of respiratory organs that allow air in and out. Urine excretion in insects happens when nitrogenous waste gets dissolved in insects’ hemolymph, a liquid that circulates their circulatory system, and then filtered into Malpighian tubules. Malpighian tubules process the nitrogenous waste and expel it out of the body through the anus or along with frass(frass is more solid).

How do insects avoid dehydration while eliminating their waste products?

Insects have an efficient mechanism that allows them to retain water while eliminating waste. They do it by reabsorbing most of the water in their feces back into their body before defecating. Besides, insects have a relatively low metabolic rate, which means they use less energy and, hence, produce less waste. Therefore, to maintain a proper balance between water and vital body nutrients, insects use two types of nitrogenous waste elimination mechanisms.


Uricotelism is a type of nitrogen excretion mechanism that insects adapted to prevent water loss. ¬†Under this mechanism, nitrogenous waste is converted into solid uric acid, which is then secreted along with frass. Uric acid is an insoluble compound that conserves water in insects’ bodies, reducing the need to eliminate water with waste.


Insects also use ureotelism, another mechanism of nitrogen excretion that leads to the formation of relatively soluble urea(a less toxic nitrogenous compound). Urea is less efficient in conserving water since it requires water to dissolve it, and it dissolves back into the hemolymph, where it can be eliminated through the anus. However, insects prefer to use the uricotelism process since it saves more water than ureotelism.

What happens when insects have to eliminate their waste?

The nutrient-rich frass left behind by insects can function as a fertilizer for plants, depending on the insect’s diet. Insects like cicadas, aphids, and grasshoppers, which feed on sap, produce frass rich in amino acids, sugars, and other vital plant nutrients. Predatory insects like ladybugs or praying mantises, while still producing frass from consumed prey, have frass rich in pathogens and enzymes that can be harmful to plants.

On the other hand, insects’ liquid waste can quickly evaporate, leaving behind impurities and solid waste behind, which can contaminate the air and the environment. However, organisms like homopterans and treehoppers often use their urine to attract ants, which distribute it over aphids and feed on their secretions. This type of beneficial interaction helps the insects to maintain a symbiotic relationship with their ant protectors.

Common misconceptions related to insect waste elimination

Myth 1: Insects drink their urine to save water

Contrary to popular belief, insects do not drink their urine or reuse it for any other purpose. Insects use their Malpighian tubules to eliminate the nitrogenous waste and allow the water and other vital nutrients to return to their body. However, they can retrieve some of the nutrients in their feces before defecating, depending on their diet.

Myth 2: Insect pee is a useful insect repellent

Although urine and frass have their benefits, including repelling predators and attracting ants, urine is not an insect repellent. Insects don’t use their urine to deter other insects or animals; rather, they use it as a natural insecticide or to maintain a symbiotic relationship with other insects.


It’s fascinating to know how insects live and use their body waste to maintain the ecosystem’s balance. They have developed various efficient mechanisms to conserve water and maintain their metabolic rate. Frass and urine excretion, though simple in insects, play a vital role in maintaining the soil’s fertility and attracting useful predators like ants. By debunking prevalent myths about insect waste elimination, we can better understand how insects and bugs function in our ecosystem.


[1] Mittapalli, O., Ali, J. G., & Johannes, F. N. (2017). Insect-microbe interactions: advances and emerging trends. Annual review of entomology, 62, 375-403.

[2] Chapman, R. F., & Capco, D. G. (1982). Chemical and physical communication in arthropods. Advances in insect physiology, 16, 33-137.

[3] Klowden, M. J. (2013). Comparative physiology and biochemistry. Elsevier.

Common Questions and Their Answers About Insect Pee

  • Do insects pee?
  • Yes, insects produce urine.

  • Do insects have kidneys?
  • No, insects do not have kidneys. They excrete waste through their spiracles and Malpighian tubules.

  • Is insect pee a useful insecticide?
  • Yes, insects use their urine as a naturally occurring insecticide to protect themselves against predators and infections.

  • Do insects drink their pee?
  • No, insects do not drink their urine. They eliminate waste and reabsorb water and other vital nutrients through their Malpighian tubules.

  • What happens to insect excrement in the soil?
  • Insect frass can serve as a fertilizer for plants, while the liquid waste can evaporate, leaving behind impurities and solid waste that can contaminate the air and the environment.

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