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This article was co-written by Shweta Sharma. Shweta Sharma is a biologist at the US Environmental Protection Agency (EPA). With nearly 10 years of experience, she specializes in insect control, integrated pest control, insect behavior, resistance control, ecology and biological control. She holds a doctorate in Urban Entomology and a master’s degree in Horticultural Environment from the University of Florida. She also holds a bachelor’s degree in Agriculture from the Nepal Animal and Agricultural Institute.
There are 12 references cited in this article that you can view at the bottom of the page.
This article has been viewed 10,802 times.
Many spiders lay their eggs in silk sacs, often hidden in webs, attached to a surface or carried on the female spider’s body. Spiders can produce many egg sacs, each containing hundreds of eggs. Spider egg sacs are woven from silk and are usually approximately the same size as the spider itself.
Steps
Consider spider egg wrap
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Notice the shape and texture. To determine if what you’re looking at is a spider’s egg sac, consider its shape and texture. The spider egg wrap is woven from spider silk, so its shape and texture can vary depending on the species of spider. Some common shapes of spider egg sacs include: [1] X Research Source
- globular
- convex disk in the middle
- soft pillow
- fine silk block
- spiky ball shape [2] X Research Source
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Observe the size of the eggshell. Spider egg wrappers are usually smaller than coins. You can estimate the size of the suspected spider egg sac to guess if it is a spider product. [3] X Research Sources
- For example, if you find an object the size of a soccer ball, it’s probably not a spider egg sac. Conversely, if the object is smaller than a coin, it is most likely a spider egg.
- Spider egg sacs are usually about the size of the spider. [4] X Research Source For example, if the spiders in your area are the size of a golf ball, their egg sacs are about the same size.
- Remember that some spiders weave only one egg sac, while others have many small egg sacs.
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Look at the colors. Most spider egg sacs are white or ivory white. However, not all are like that. Some varieties are brown, yellow, or even lemon yellow. [5] X Research Sources[6] X Research Sources
- Look at the color to determine if an object is a spider egg sac. For example, if the object is pink or black, it’s probably not a spider’s egg sac.
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Pay attention to the location. Some spiders carry an egg sac on their body, but most often hang the egg sac in a web. [7] X Source of Research If you notice an object that could be a spider’s egg sac, look to see if it hangs in a web or is attached to a wall or other surface with spider silk threads.
- Some spiders lay their eggs in wrappers on the ground, so you won’t always see webs.
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Note the baby spiders. The presence of baby spiders also indicates that you have probably seen a spider egg sac. Female spiders can lay hundreds of eggs in one sac, and when the eggs hatch, many baby spiders will emerge from the egg sac. [8] X Research Sources
- If you see pale spiders crawling around what you suspect is an egg sac, it may be a spider egg sac.
Observe spiders and webs
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Note the shape of the spider’s web. The webs of different spiders also have different shapes. [9] X Research Source You can’t always use the web observation method because not all spiders encase their eggs in webs. However, if you can’t identify the spider by looking at the egg sac, it’s a good idea to check the web. Common spider web patterns include: [10] X Research Sources
- Globular. The spider web is round.
- The tangles. Cobwebs like cotton balls often appear in the corners of the ceiling.
- Tubular. Spider webs are tubular in places where few people pass.
- Flat plate. Spider webs are flat or bowl shaped.
- Foam form. Slightly sticky cobwebs of indeterminate shape.
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Consider the location of the spider web. Spiders nest everywhere. You can find spider webs in holes in brick walls, in corners of rooms, in trees or in piles of dry leaves. [11] X Research Source Look at the location of the web to narrow down which species of eggs you are observing. [12] X Research Source
- For example, tarantulas usually live in underground burrows with a thin layer of cobwebs above the cave entrance. The discus spider often spins small gray webs on tree branches and brick walls, and the comb spider often webs on houseplants. [13] X Research Source
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Observe closely if possible. Since there are many types of spider egg sacs that look quite similar, it can be difficult to identify the spider without seeing the spider that spawned the egg sac. Some spiders will leave after laying eggs and we will not see the spider around, but some spiders will stay nearby to protect the egg sac until the eggs hatch. [14] X Research Source
- If you do find the spider that spawns the egg sac, a close look at the spider is your best chance for an accurate identification. [15] X Research Source
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Note the color. Spiders come in many different colors and patterns. Some spiders such as the Yellow Stripe Spider are recognizable, while other spiders look quite similar.
- Try to pay attention to details. For example, if the spider is brown, what is the shade of brown? Does it have any other signs? Is the brown tint uniform over the entire body?
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Notice the hairs on the spider’s body. The entire body of the spider is covered with a layer of silk, but it is not always visible. If you see hair on a spider, try to think of how that hair would be described.
- For example, do you recognize the hair on a spider from a distance, such as the Jumping Spider, or is it difficult to see the hair on a spider up close, such as the Brown recluse?
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Estimated size. Many people are inherently afraid of spiders, so they often imagine that it is bigger than it really is. However, an accurate estimate of the spider’s size may make it easier to determine. [16] X Research Source
- Try to be objective. Is that spider the size of an eraser? By coin? With a golf ball? Or by your fist?
- Most spiders average a few centimeters in size. Try to estimate the size of the spider in centimeters to get more information to help identify the spider.
Warning
- Do not try to catch the spider or handle its egg sac if you do not know it well. Some spiders are venomous, which can cause severe pain and damage. Call a pest control service if you think there is a spider infestation in your home.
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This article was co-written by Shweta Sharma. Shweta Sharma is a biologist at the US Environmental Protection Agency (EPA). With nearly 10 years of experience, she specializes in insect control, integrated pest control, insect behavior, resistance control, ecology and biological control. She holds a doctorate in Urban Entomology and a master’s degree in Horticultural Environment from the University of Florida. She also holds a bachelor’s degree in Agriculture from the Nepal Animal and Agricultural Institute.
There are 12 references cited in this article that you can view at the bottom of the page.
This article has been viewed 10,802 times.
Many spiders lay their eggs in silk sacs, often hidden in webs, attached to a surface or carried on the female spider’s body. Spiders can produce many egg sacs, each containing hundreds of eggs. Spider egg sacs are woven from silk and are usually approximately the same size as the spider itself.
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