Orb Weaver Spider Web Building & Prey Capture
This guide explains how orb weaver spiders construct their iconic spiral webs and use them to capture prey. You’ll learn the step-by-step process from silk production to prey handling, along with common mistakes in understanding and tips for observation. No special equipment is needed—just curiosity and patience.
What You’ll Need
- A quiet outdoor area with orb weaver spiders (gardens, shrubs, or porch lights)
- Flashlight (red light preferred to avoid disturbing the spider)
- Notebook or phone for notes
- Patience and time (web building takes 30–60 minutes)
Step-by-Step
- Find a suitable location. Look for orb webs in the morning or evening—they are often strung between plants, fences, or eaves. The classic circular web with radial spokes is the signature of an orb weaver.
- Observe the spider’s position. Most orb weavers sit at the hub (center) or in a retreat at the edge of the web, connected by a signal line. Note the web’s orientation—many are vertical.
- Understand the silk types. The spider produces several kinds of silk: dragline (strong, for frame and radii), viscid (sticky, for the spiral), and auxiliary (non-sticky, temporary). Each serves a distinct purpose.
- Watch the frame construction. The spider first releases a silk line that catches the wind and attaches to a distant anchor. It then walks across this bridge, reinforcing it with additional threads to form the outer frame (often triangular or polygonal).
- Note the radius formation. From the frame, the spider lays non-sticky radial threads that converge at the hub. It typically builds radii in a specific order, often alternating sides to keep tension balanced.
- Observe the temporary spiral. Starting from the hub, the spider lays a widely spaced, non-sticky spiral outward. This serves as a scaffold and helps the spider measure distances for the final sticky spiral.
- Watch the sticky spiral construction. The spider then reverses direction, moving from the outer edge inward, laying a closely spaced spiral of viscid silk. It removes the temporary spiral as it goes, using its legs to guide the new thread. The spacing is remarkably uniform.
- See the final touches. The spider may add a signal thread from the hub to its retreat, and sometimes a stabilimentum (a zigzag or decorative band) in the web’s center—though not all orb weavers do this.
- Wait for prey. The spider sits at the hub or retreat, waiting for vibrations. When an insect (like a fly, moth, or beetle) hits the web, it becomes entangled in the sticky spiral.
- Observe prey capture. The spider feels the vibrations, rushes to the prey, and quickly wraps it in silk, turning the insect with its legs while applying more silk. It may bite the prey to inject venom, which paralyzes and begins digestion.
- Note the feeding process. The spider either feeds immediately at the capture site or carries the wrapped prey to the hub or retreat. It regurgitates digestive enzymes onto the prey, then sucks up the liquefied tissues.
- Watch web maintenance. After feeding, the spider repairs damaged sections or rebuilds the entire web, often daily. Old webs are sometimes eaten to recycle the protein.
Common Mistakes
- Assuming all webs are orb-shaped. Many spiders build irregular or funnel webs; orb weavers are specifically those that construct the classic circular design.
- Thinking the web is purely for trapping. The web also serves as a vibration sensor, alerting the spider to prey and potential threats.
- Believing all orb weavers rebuild nightly. Some do, but others maintain their webs for days or weeks, repairing as needed.
- Confusing the hub with a retreat. The hub is the central area; the retreat is a separate silk shelter off to the side, connected by a signal line.
- Assuming the sticky spiral is sticky everywhere. Only the viscid spiral is adhesive; the radial threads and frame are not.
Tips
- Observe at night with a red flashlight—spiders are less disturbed by red light.
- Watch a spider build a web from scratch by gently removing an old web (if you have permission) and waiting for the spider to rebuild.
- Use a magnifying glass to see the tiny droplets of glue on the viscid silk.
- Keep a journal of web-building times—many species build just before dawn or dusk.
- If you want to photograph, use a tripod and macro lens; avoid using flash directly on the spider.
Troubleshooting
- No web appears: The spider may be in its retreat or hunting elsewhere. Check nearby foliage for a curled leaf shelter.
- Spider abandons the web: Disturbance or poor location may cause abandonment. Wait a day and look for a new web nearby.
- Can’t see the sticky spiral: The silk is very thin; try backlighting the web with a flashlight on a low angle.
- Prey escapes: Large or strong insects may break free before the spider reaches them. This is natural; the spider will repair the web.
- Web seems incomplete: The spider may be interrupted. Watch again later; it often resumes or rebuilds.
Frequently Asked Questions
How long does it take an orb weaver to build a web?
Most orb weavers complete a web in 30 to 60 minutes, though some large species may take up to two hours.
Do orb weavers eat their old webs?
Yes, many orb weavers consume the old web before rebuilding. This recycles the silk proteins, which are costly to produce.
Why do orb weavers rebuild their webs every day?
Daily rebuilding ensures the sticky silk remains effective, as the adhesive loses its tackiness after a day and the web accumulates debris and damage.
Are orb weaver spiders dangerous to humans?
Orb weavers are not aggressive and their venom is harmless to humans, though a bite may cause minor pain or swelling in some cases.
How do orb weavers avoid getting stuck in their own webs?
They have specialized leg movements and only their tarsi (tips) touch the sticky silk, plus they often have non-stick areas on their legs. They also walk on the non-sticky radial threads.
What do orb weavers eat besides insects?
They primarily eat small flying insects, but they may also capture other arthropods like small spiders or mites if they land in the web.
Related
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