What Does A Spider Sack Look Like?

How to Identify Spider Egg Sacs

Spiders have an interesting life cycle. They develop through what’s known as gradual metamorphosis and have three life stages – egg, nymph and adult. Spiders lay multiple eggs, if not hundreds, at one time. These eggs are contained within a spider egg sac, mainly to protect them from predators. The eggs hatch into nymphs, which are the same color and shape as the adults, but are much smaller. The nymphs grow larger by shedding their outer skin several times before reaching adulthood. This process is called “molting.”

Trying to identify the species of spider by examining the nymphs may be difficult because they are often very small. However, having a basic knowledge of what spider egg sacs look like may give you clues as to what species a spider may be.

Egg sac placement

Depending on the species, spiders place their egg sacs in a variety of locations. They can be found in the web itself, on the underside of leaves, attached to tree branches or in a burrow. They can also be placed in undisturbed areas of your home. Some spiders carry their egg sacs attached to their body, providing even more protection for the valuable cargo inside.

Spider egg sac identification

Spiders make egg sacs that are loosely woven from silk, much like that used to spin their webs. These sacs are typically about the same size as the spider. Other insects, such as moths, also use silk to spin cocoons for their pupal stage. These cocoons closely resemble the egg sacs of spiders. Insects and other prey caught in the spider’s web are encapsulated in silk by the spider and often look like an egg sac. In general, spiders live a few months to as many as two years, and can produce several egg sacs in their lifetime. Some species of tarantulas can live up to 20 years.

Identify the spider first

Most types of spiders are harmless to humans, but there are a few species that can cause severe injury, such as the black widow and the brown recluse spider. Spider egg sacs are usually white to cream in color and will be either round or oblong in shape. Some egg sacs are smooth, while others may contain spikes or bumps.

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Black widow eggs are small, about the size of a pencil eraser. A black widow’s web is messy and unorganized. The black widow egg sac can contain as many as 400 eggs and is placed randomly in the web. You’re most likely to find brown recluse egg sacs in late spring and throughout the summer. Their egg sacs are off-white to tan in color and round to cone-shaped. Each brown recluse egg sac could have as many as 300 eggs inside.

It’s important to have a basic understanding about what spider egg sacs look like because you don’t want to handle one belonging to a dangerous spider like the black widow or brown recluse. Why not simply take spiders out of the equation altogether and call your pest management professional? If spiders are causing you concern, Terminix® can help.

How to Identify Spider Egg Sacs

How Many Eggs Can a House Spider Lay?

Spiders might give you the willies, especially in your house. They also might be your best friend in the garden, eating pest insects. In either case, using egg sacs can be one way to identify spiders in your house or yard. All of the 40,000 known species of spiders lay eggs and most of them encapsulate their eggs in a sac made of silk, much like the silk that some spiders use to spin webs. Some, such as the wolf spider, carry their eggs on their back, making identification easy, but others require closer examination.

Identifying Spider Egg Sacs

Make sure that you have a spider egg sac. Insects trapped in spider webs and wrapped in silk can look much like egg sacs. Other insects such as moths make silk pupal cases that could be mistaken for egg sacs, often in leaves or dead vegetation. Opening the sac with a pin and examining the contents with a magnifying glass can help rule out these possibilities.

Note where the sac was found. Egg sacs may be associated with a spider-built structure, such as a web or a burrow. The shape and location of the web or burrow can help you narrow down the species. Alternatively, you might find egg sacs in sheltered areas within your house or associated with vegetation, such as the underside of leaves. Some species of spiders prefer the former, while others prefer the latter.

Note the physical description of any spiders you see in the area around the egg sac. Most spiders die after reproducing, but knowing the species that live in the area can help you narrow down the identity of the spider that left your egg sac.

Note the shape and color of the egg sac. Most egg sacs are white or cream colored, but others can be yellow or even light green, such as the green lynx spider. It is also good to note if the egg sac is round or oblong and if it has any bumps or spikes. The egg sac of the brown widow spider is round with distinctive spikes, whereas that of the black widow is round and smooth.

Note the time of year. Many spiders hatch out of egg sacs in the spring, but noting the date you found the egg sac can limit your search to species that were mating during that time.

Use a guide to identify your spider. Using a printed or online field guide to spider species, you can see what spiders live in your area and use the information you collected to narrow down the possible species that laid your egg sac.

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Things You’ll Need

  • Magnifying glass
  • Pin
  • Field guide or online identification guide

Universities and state agencies often have spider field guides that are specific to your area.


Some spiders have painful or poisonous bites, so be careful that there are no adult spiders nearby when you examine the egg sac.


  • Insect Identification: North American Spiders
  • The Find-A-Spider Guide: Webs, Burrows and Sgg Sacs Not Made by Spiders
  • Center for Invasive Species Research: How to identify Brown Widow Spiders
  • Galveston County Master Gardeners: Green Lynx Spider


Spider Eggs in the House: What do You Need to Know?

Most household spiders are harmless to humans and prefer to feast on bugs rather than people. And once these spiders move into your home, they soon begin laying eggs. Here are some things you should know to help avoid a spider infestation — and some telltale signs to be on the lookout for.

500 Spider Eggs In Incubator — Black Widow Egg Hatching TimeLapse

Spiders living in your home can lay many eggs very quickly. A female spider wraps her young in a silken egg sac, which she may hide in a web or carry with her as she forages through your house. Female brown and black widow spiders can produce 10 to 20 egg sacs in their lifetime, each containing 150 to 300 eggs. However, the survival rate for these eggs is low.

Spider eggs typically hatch in 2 to 3 weeks, which can vary based on species and season. Once spiderlings fully emerge, they usually settle close to the nest area for several weeks before moving on and staking out their own territory.

See also:  What'S A Brown Recluse Spider?

Helping get rid of spider eggs in the house

Taking measures to help keep your home free of egg sacs and the spiderlings they contain is an effective way to help avoid an infestation. Luckily, there are several simple methods for helping remove or eliminate spider eggs you may find within your home.

Spider eggs are fragile and can be removed with a broom or vacuum cleaner. If using a vacuum, remove the bag after each cleaning and dispose of the debris, including the eggs, in a sealed plastic bag. When sweeping up spider eggs, try to make sure that no spiderlings have escaped the dustpan before you seal the eggs in a plastic bag.

You can also use glue traps available at your local market or hardware store to help get rid of any spiders you discover in your house. Follow the manufacturer’s instructions carefully and only use these products safely out of the reach of children and pets.

Helping keep new spiders from moving in

To help discourage new spiders from building nests inside your home, reduce clutter in and around your property as much as possible.

  • Place backyard woodpiles, mulch, rocks and compost well away from the home.
  • Store items, such as gardening gloves, clothes and sports equipment, in sealed plastic bags that will help keep spiders out.
  • Carefully inspect your attic and crawl space and clear out spider webs and eggs wherever you find them.

The Best Mouse Trap Method

Everyone has seen the cartoon mouse trap: A big wedge of cheese perched precariously on a small wooden rectangle, just waiting for an unsuspecting mouse to come along. Most modern mouse traps don’t use pieces of cheese, although they can still use food as bait. One of the most popular baits, believe it or not, is peanut butter. There are still versions of the snap trap from cartoons, but there are also other kinds like electronic traps. Because these traps usually mean dealing with dead mice, plenty of people wonder if there’s a way to help get rid of mice without classic mouse traps. Although mouse traps are the most effective in helping to get of mice, you can also try the following natural methods to see if they help remove these pesky rodents.

How to Help Remove Fruit Flies from Your Home

Fruit flies are one of the most common household pests and they can be a huge nuisance for homeowners. Not only that, but researchers have found that fruit flies can “transfer bacteria from a contaminated source, food, or waste to surfaces or ready-to-eat food.


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