(844) 211-7378Book Inspection

What Do Black Widow Spiders Eat?

October 22, 2023 - Black Widow Spiders

Author - Tom Miche

what do black widow spiders eat

Black widow spiders, scientifically known as Latrodectus, are carnivorous spiders that primarily feed on insects. Their diet typically consists of a wide variety of arthropods, but they occasionally consume other small prey as well. Here's an overview of the black widow spider's diet:


Black widow spiders are opportunistic predators that primarily feed on a variety of insects and arthropods. The specific insects they consume can vary depending on their habitat and what is readily available. Here's a list of common insects that black widow spiders often eat:

  • Flies: Black widows frequently capture and consume various types of flies, including house flies, fruit flies, and other small flying insects.

  • Mosquitoes: Mosquitoes are a common food source for black widow spiders, as they are attracted to the spiders' webs and become ensnared in them.

  • Grasshoppers and Crickets: Grasshoppers and crickets can be part of a black widow's diet, particularly when they become trapped in the spider's web.

  • Beetles: Various types of beetles may end up in a black widow's web and become prey.

  • Ants: Black widows may capture ants, especially if they stray into the spider's web.

  • Moths and Butterflies: Larger flying insects like moths and butterflies can be caught by black widow spiders, providing a substantial meal.

  • Caterpillars: These are a common prey item, especially for juvenile black widow spiders. Caterpillars often become trapped in the webs while searching for food.

  • Bees and Wasps: While less common, black widow spiders may catch and eat bees and wasps that fly into their webs.

The primary mode of hunting for black widow spiders is through their webs. They create messy, three-dimensional webs that are designed to capture any insect or arthropod that inadvertently lands on them. Once the prey is ensnared, the black widow injects venom to paralyze it before consuming the immobilized victim. Their diet is largely influenced by what insects are present in their habitat and get caught in their webs.

Other Spiders:

Black widow spiders are primarily insectivores and typically feed on a variety of insects and other arachnids, rather than other spiders. While they may occasionally consume other spiders, it's not a common part of their diet. Here are some scenarios in which black widow spiders might eat other spiders:

  • Cannibalism: Black widow spiders are known for cannibalism, particularly when a male approaches a female for mating. In many instances, the female may consume the male after mating, which can be advantageous for the female in terms of acquiring nutrients.

  • Territorial Disputes: If black widow spiders encounter other spiders in their territory, especially if the space they've created their web is invaded, they may engage in aggressive interactions. These interactions can sometimes lead to the consumption of the rival spider.

  • Accidental Capture: If a smaller spider gets entangled in the black widow's web, the black widow may consume it. However, this is less common because the primary purpose of their web is to capture flying insects.

  • Food Scarcity: In situations where black widows are experiencing a scarcity of their typical prey (insects), they may resort to eating other spiders as an alternative food source.

While black widow spiders may consume other spiders under these circumstances, their primary diet consists of insects and arthropods that get caught in their webs. The consumption of other spiders is not a regular part of their feeding habits but can occur under specific conditions.

Small Arthropods:

Black widow spiders are opportunistic predators that may consume a variety of small arthropods when they become ensnared in their webs. The specific small arthropods that black widows might eat can vary depending on their habitat, but some common examples include:

  • Scorpions: Black widows are known to capture and consume small scorpions that wander into their webs.

  • Centipedes: Small centipedes can become trapped in a black widow's web and serve as a potential food source.

  • Millipedes: Similarly, small millipedes may also find themselves caught in the spider's web and become prey.

  • Harvestmen (Daddy Longlegs): Daddy longlegs are often caught by black widows when they inadvertently stray into the spider's web.

  • Pseudoscorpions: Some species of pseudoscorpions are tiny and can become prey for black widow spiders.

  • Mites and Ticks: Various small mites and ticks can be captured by black widow spiders when they enter the spider's web.

While black widow spiders may consume these small arthropods, their primary diet still revolves around insects that get caught in their webs. The consumption of other arthropods typically occurs when these organisms become accidental victims in the spider's hunting grounds.


Black widow spiders are primarily insectivores, and their diet primarily consists of a wide range of insects and arthropods. However, they are opportunistic predators, and there are occasional instances where they may consume small animals, especially when the opportunity arises. Animals that black widow spiders might eat can include:

  • Frogs: In some rare instances, black widow spiders have been known to catch and consume small frogs that become trapped in their webs.

  • Small Birds: While uncommon, particularly small bird species may get ensnared in a black widow's web, providing a substantial meal.

  • Lizards: Small lizards are another potential prey item, especially if they enter the spider's territory and accidentally fall into the web.

While black widow spiders may eat these animals when given the opportunity, these cases are relatively rare. Their primary diet consists of insects and arthropods that get caught in their webs. The consumption of small vertebrates and other animals typically occurs when these creatures accidentally enter the spider's territory or become ensnared in their webs.

Web Maintenance:

Black widow spiders, like many other spiders, do consume their own webs as part of their natural behavior. This process of consuming their silk and recycling their webs is known as "web maintenance" or "web recycling." Here's how it typically works:

  • Digesting Silk: After a period of time, a black widow spider's web can become dirty, damaged, or lose its stickiness due to dust, debris, and exposure to the elements. To maintain the structural integrity of the web and ensure it remains an effective tool for catching prey, black widows will systematically break down sections of the web.

  • Reabsorbing Nutrients: The spider then consumes the portions of the web it has dismantled. The silk contains nutrients and proteins, and by reabsorbing the material, the spider can recycle these resources and use them for constructing a new web.

  • Web Reconstruction: After consuming and recycling the old web material, the black widow spider will proceed to rebuild or repair its web. This process allows them to create a fresh, effective web for capturing prey.

Web maintenance through the consumption of silk is a remarkable adaptation that helps these spiders conserve energy and resources while ensuring their hunting apparatus remains functional. It's an example of the efficiency and resourcefulness exhibited by many spiders, including black widows.

How Do Black Widow Spiders Eat?

Black widow spiders have a unique and fascinating way of feeding. Their feeding process involves the following three steps:

  1. Capturing Prey: Black widow spiders are web-building spiders. They create messy, three-dimensional webs that are strategically positioned to capture flying insects and other arthropods. When an unsuspecting prey item, such as an insect, becomes entangled in their web, the spider quickly senses the vibrations or struggles of the trapped prey.

  2. Injecting Venom: Once the prey is ensnared, the black widow spider approaches it and delivers a bite. The spider's fangs contain venom, which is injected into the prey. This venom serves multiple purposes:

    • Paralysis: The venom contains neurotoxins that rapidly paralyze the prey. This paralysis not only immobilizes the victim but also prevents it from causing damage to the spider or escaping.

    • Predigestion: The venom also contains enzymes that begin the process of breaking down the internal tissues of the prey. This predigestion turns the prey's insides into a liquefied mass, making it easier for the spider to consume.

  3. Feeding: With the prey immobilized and partially digested by the venom, the black widow spider uses its fangs to puncture the prey's body and suck out the liquefied contents. The spider essentially feeds on the liquid meal, leaving behind an empty exoskeleton or remnants of the prey.

The black widow spider's venom is potent and contains toxins that are harmful to its prey. While black widow bites can be painful to humans and occasionally result in medical concerns, black widows generally do not bite humans unless they feel threatened, and fatalities from their bites are rare. These spiders primarily use their venom for subduing and consuming their prey.

Request Your Free Inspection

Complete the form below to request your free inspection.

Customer Reviews

I switched from another pest control company due to high pressure sales/bad billing practices, and switched to Miche. They have been excellent. Excellent customer service, very effective pest treatments, competitive pricing. I highly recommend.

Tanya K. | 21 June 2021
two parents and two kids