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Are Cockroaches Decomposers or Detritivores? (Answered!)




Cockroaches are one of the most common insects found in households. They are Arthropods and can feed on plant-based as well as animal-based material. 

Cockroaches are important scavengers and detritivores in the environment, but they are not decomposers in the classical sense. They are omnivores that help break down organic matter, which recycles nutrients back into the soil. This benefits plants indirectly, which need those nutrients to grow.

So, they are omnivores that are often considered pests. They can sometimes act as detritivores too, which means that they feed on dead plants and animals. Most of the time they can be found hovering around dirty and unhygienic areas. 

They are popularly known for contaminating uncovered food, making it unfit for consumption. 

Cockroaches are omnivorous animals that feed on a wide variety of food types. They mostly eat other small insects and food items like grains and fungi. Cockroaches have a long life span and can reproduce rapidly. In the wild they will eat anything they can find and are a part of the food web.

Where do cockroaches live and what do they eat?

Cockroaches are predominantly scavengers, living, and foraging in dark, damp, and humid environments. Mainly in unhygienic areas and settlements. Cockroaches primarily inhabit warm climates and can be found around the world. 

Cockroaches play important roles in ecosystems, consuming decaying plant and animal matter, as well as serving as food for many other animals, such as birds.

The young stage of nymphs begins life encased in an egg case. The nymphs molt several times before they become full-sized adults. The nymphs eat bacteria and fungus, and smaller insects, and scavenge for animals as the adults do.

Cockroaches will eat a wide variety of foods but prefer decaying plant and animal matter. 

Cockroaches can find food almost anywhere and will eat anything they can chew apart. Especially if it contains a lot of calories.

Cockroaches use their long, flat, beak-like mouthparts to suck up food. Cockroaches may feed on cooked food or they may eat the decaying matter that other animals have left behind. 

As cockroaches are invertebrates belonging to the Phylum Arthropoda, they have mandibles and maxillae that help them chew food which is further digested in the crop after it is passed through the esophagus.

Cockroaches have a tough digestive system that is able to digest tough foods, such as decaying matter or food items that are not normally safe to eat for other animals including humans. 

Why are Cockroaches Important for the Ecosystem?

Cockroaches play an important role in the ecosystem by breaking down organic matter and recycling nutrients.

They help to decompose leaves, dead trees, and other plant debris which returns essential nutrients back into the soil. This assists in the growth of new plants and help to maintain healthy ecosystems.

As scavengers and detritivores, cockroaches help to clean up areas by eating dead animals and decaying plant matter. 

This helps to prevent the spread of disease and keeps ecosystems free of harmful bacteria and pathogens. 

But at the same time, these cockroaches may carry harmful pathogens along with them and contaminate food in households.

Cockroaches are also an important food source for many animals, including reptiles, amphibians, birds, and mammals.

By eating cockroaches, these animals help to keep populations in check and ensure that they do not become a nuisance.

Are Cockroaches Carnivores, Herbivores, or Omnivores?

Cockroaches are omnivores as omnivorous animals have the capability to eat and digest plant and animal matter or both. To a certain degree, they can even eat fungus, bacteria, and other small organisms. 

Cockroaches are consumers because they depend on other organisms for their nutrition.

They are neither producers nor decomposers as they cannot prepare their own food and they do not participate in the very last step of processing dead and decaying matter as their main form of feeding.

Cockroaches belong to the relatively small group of insects that are truly omnivorous! The majority of insects are herbivores.

Cockroaches are omnivores, which means they can consume plant material as well as small animals. 

There are not that many insects that are truly omnivorous, but mosquitoes, earwigs, and cockroaches are among them!

What Type of Consumer is a Cockroach?

In a typical food chain, Cockroaches are generally secondary consumers as they are omnivores.

When they feed on an animal they derive energy from primary consumers whereas when they eat plant-based material they function as primary consumers as then they derive energy from producers. 

Are Cockroaches Decomposers?

Cockroaches are not decomposers as they do not digest dead and decaying matter but can feed on it and derive nutrition from it.

Whereas cockroaches may eat nasty things, they are not true decomposers.

Decomposers are the ones that break down the organic components of dead and decaying matter and convert them into simpler substances but cockroaches do not perform that and hence cannot be called decomposers.

Where are Cockroaches in the Food Chain?

Cockroaches can be found on the first and second energy levels of the food chain. 

However, they are mostly considered secondary consumers as they eat plants and smaller animals that are not predators themselves. 

Are Cockroaches Autotrophs or Heterotrophs?

Cockroaches are heterotrophs because they feed on other living organisms and cannot produce their own food.

Practically no animals are autotrophic because animals do not get their energy directly from the sun like plants do. That is, animals like cockroaches cannot make their own energy!

What Animals Prey on Cockroaches?

Cockroaches are common prey for many animals including birds, frogs, spiders, and toads.

What decomposers eat cockroaches when they die?

Cockroaches are eaten by a variety of different scavengers and decomposers when they die.

Smaller detritivores like flies, worms, beetles and snails will find the cockroach corpse first and start to feast. Then, larger scavengers like rats, crows, ravens, magpies and even other cockroaches will come to eat the decaying flesh.

A dead cockroach will be eaten by scavengers and bacteria in a matter of days or weeks. After days or weeks have passed, little actual flesh is left and only the tough parts like shell, antenna and hairs are available for consumption by the real decomposers – bacteria and fungi!

Whereas fungi are more into decomposing plant matter, bacteria are certainly going to present and the gasses released by their digestion can be smelled from afar. 

Bacterial species such as Pseudomonas, Bacillus and E. coli will start eating away at the very last parts of the animal till absolutely nothing is left! This final process can take months to years.


In this blog post, I have looked into the eating habits of cockroach as an animal that is often underestimated. This insect is often found in a household setting and looking at them gives a feeling of disgust.

At the same time, cockroaches are very important in the ecosystem as they are one of the active participants in many different food chains. They are also one of the most common animals in our homes. 

See more surprising facts about cockroaches in this video!

Cockroaches are omnivore insects, eating both plant and animal materials. They are also detritivores, eating decaying matter and they are also decomposers! 

It is quite rare for insects to be omnivores, and most insects are in fact herbivores.

If you would like to read more about cockroaches and why they are important in the ecosystem, please check out my other posts!

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