Do Spiders Eat Roaches?

Spiders love to devour roaches.

They’re also one of the most common pests in your home. If you’ve spotted one in your attic, it’s essential to take the proper steps to prevent them from getting inside.

So, do spiders eat roaches?

Yes. Spiders eat roaches and so do other arthropods. So far, scientists have identified over 35,000 species of arachnids.

These include spiders, scorpions, mites, ticks, and whip scorpions. Arthropods have been around for hundreds of millions of years.

They’re also really diverse, with over 1 million species. So, spiders eat roaches.

Do Spiders Eat Roaches?

Often, spiders are confused with roaches, but they’re actually quite different.

For one thing, spiders have eight legs while roaches have six. Furthermore, spiders have only two body parts while roaches have four.

However, the two do share one similarity: they are both omnivores. This means that neither eats meat exclusively, but rather they eat both meat and vegetables.

Because of this, roaches and spiders often end up eating each other. However, many of the spiders that eat roaches are harmless to humans.

How Do Spiders Kill Cockroaches?

The venom of all spiders is poisonous to humans but not deadly in small amounts.

Venom is injected from fangs into prey when the spider bites it.

It paralyzes and kills the prey by causing blood to clot around its body and preventing it from breathing properly. The venom is also painful to the predator’s prey.

Most species of spider cannot inject their venom far enough into their victim to kill it unless it’s already dead or dying first.

Since all living creatures have to eat, they occasionally kill and eat each other to survive.

The venom glands are linked with the digestive system of the spider, so it has to swallow its victims whole in order to digest them and get the nutrients they contain, which includes protein and other necessary vitamins and minerals.

Spiders have developed a unique behavior where they don’t eat their own kind and help each other out in times of need by nursing the helpless young of other spiders to their adulthood.

The prey is partially digested by the spider’s saliva before it is swallowed completely.

Does it Matter What Type of Cockroach it is?

There are typically five different species of cockroaches commonly found in homes: German cockroaches, American cockroaches, Oriental cockroaches, Brown-banded cockroaches, and Smokey-brown-banded cockroaches.

While all of these species are dangerous to human health due to the presence of harmful bacteria in their feces, they all share the same characteristics: they are all omnivores and they love to eat just about anything they can find.

This includes human food as well as pet food, garbage, and even human skin.

That being said, it doesn’t matter what type of roach you have in your home – they all taste delicious to a spider.

Although you’re most likely not going to encounter any big scary-looking tarantulas in your household, there are plenty of small and friendly-looking black widows and brown recluses that will gladly feed on the nasty little pests that are crawling around your home.

Their venomous bite can be fatal to humans in extreme cases but they won’t attack unless they feel threatened.

Included in this group are the brown-banded and the smokey-brown-banded cockroaches. These are the most common types of indoor cockroaches in America. They are also the most common type of pest that exterminators have to treat on a regular basis.

Because they’re usually found in the kitchen area of a house, they can quickly contaminate your food with bacteria – even if you’re very careful about keeping your kitchen clean.

These pests are also very agile and can climb on walls and ceilings easily.

Yellow sac spiders, domestic spiders, hobo spiders, common cellar spiders and funnel webs all live indoors and are usually found in basements or crawl spaces.

What Kinds of Spiders Eat Roaches?

The American house spider, huntsman spiders, runner spiders, jumper -spiders and the false widow are all common indoor species that will prey on all types of insects including flies, mosquitoes, beetles, wasps, bees and other creepy crawlies.

But they are also more than happy to feed on other arthropods such as crickets, grasshoppers and millipedes as well.

Black widows and brown recluses are two notorious outdoor species that have been known to invade houses from time to time.

Brown recluse bites are painful but rarely deadly to humans but black widow bites can be fatal.

How Often Do House Spiders Eat?

The spiders are great at catching and devouring their meals however they (or you) will starve to death if the prey isn’t replenished on a regular basis.

They will eat anything they can catch in their web including insects, small rodents and even each other.

House spiders need a steady supply of food in order to survive which is why you should regularly dispose of old webs.

Even while they can consume as much as a third of their own body weight every day, they still have to replenish their food supply on a regular basis or they will eventually die.

What Else Do Spiders Eat?

The American house spider eats all kinds of insects – flies, mosquitoes, beetles, wasps, bees and other creepy crawlies.

They also like to catch other arthropods such as crickets, grasshoppers and millipedes as well. They are opportunistic feeders and will feast on anything that moves – even other bugs.

In addition to mosquitoes, some moths, earwigs, sowbugs, scorpions and other arthropods are also on the menu for the hobo spider.

They enjoy hunting at night, often hunting from their hiding places in old logs or woodpiles.

They prefer to stay outdoors but can enter your home through open windows or other entry points.

Their bite is not usually lethal for humans but can be very painful. Hobos are one of the most commonly encountered types of outdoor-dwelling house spiders in the US.

Can I Use Spiders to Get Rid of Roaches?

Roach-eating spiders may be a natural way to get rid of roaches but they are not practical to use because of their small size and the fact that they usually hunt at night. But they do work to some extent.

But bear in mind that spiders are really little, and while they may eat some roaches, they are no match for a roach infestation.

How to Keep Spiders Out of Your Home

Because spiders have little interest in the food we store in our cupboards or the food we eat on our plates, they are not a threat to us unless we are allergic to them or their venom is poisonous to us.

However, their presence in our homes can be a source of great distress and frustration because we don’t like them running around our homes and getting in our hair.

In addition, we have concerns about the safety of our children and other family members who may suffer an allergic reaction to their bites.

Luckily there are things we can do to keep spiders out of our homes. The best strategy to discourage spiders from setting up shop in your home is to keep your home clean.

Why Do Spiders Curl Up When They Die?

You could discover a dead spider among the dust bunnies and long-lost toys that collect in the corners of your home’s closets or under your bed.

You may even find dozens of dead ones squished under the refrigerator or behind the dryer. But don’t panic! It’s just a normal part of the life cycle of the arachnid.

The spider has brought its legs close to its body, so if it’s lying flat, chances are good that it died very recently.

Do Common House Spiders Bite?

Most common household spiders are not aggressive and will not bite unless provoked by contact with a human body or another animal.

So, unless you are wearing your Halloween costume inside your house on a dark and stormy night, it is unlikely to encounter any unpleasant encounters.

They generally avoid us, and if we find ourselves face to face with one while we are eating our cereal in the morning, we should just leave it alone and move on with our day.

It is unusual, but conceivable, that the common house spider could bite you if it feels threatened or is protecting its young.

The bite of a common house spider is not dangerous to humans; however it can be quite painful and cause swelling around the site of the bite.

Should You Kill Your House Spider?

If you don’t have any other pests but are worried about the presence of a few harmless-looking black widows in your basement, then you might want to think about getting rid of them. Otherwise leave them alone.

It’s better not to kill them unless they are a danger to you or your family. If they are just there to scare you or make a mess out of your clothes, then simply ignore them.

If a cockroach or other bug manages to make its way into your home, then killing the pest is a good idea since these bugs can cause significant damage to your home if they are allowed to reproduce unchecked.

But otherwise killing a spider is not a good idea. It is better to simply move them into the outdoors where they can be rid of without causing any harm to you or your family.

In this approach, it has often been observed that people generally tend to resort to using chemical pesticides to kill spiders and get rid of them from their premises.

Do Spiders Have Transparent Blood?

Although most people think of red -blooded animals when they think of blood, many invertebrates actually have transparent blood.

Like insects, most arthropods have translucent blood which is colored by pigments in the blood itself rather than by red blood cells. In some species, the blood is actually colorless and transparent!

This is caused by the fact that the hemoglobin protein that carries oxygen in the blood is broken down into tiny particles that scatter light, rather than forming large clumps as they do in vertebrates.

This blue tint is not particularly thick, however, so the blood is still quite translucent.

Also Read: Does Bleach Kill Roaches?


Common household spiders may sometimes be a nuisance to you because they may occasionally find their way into your home and lay their eggs in your pantry, on your kitchen shelves, in your closets or even on your body while you are sleeping.

You may not even realize that a spider is crawling on you until you feel a sharp bite.

Spiders found in homes are more often harmless than dangerous to humans and pets and will usually not cause much harm if they are allowed to live out their lives outside your home.

You may not like the spider that has set up housekeeping in your home, but unless there are a large number of them, you probably won’t have to worry about them too much.