Gumfoot: a trap that releases
Locate the release point and the stored energy in a cobweb system, then compare the lab's settling motion.
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Original WebTug explanation with animated teaching diagrams and credited still photographs. On-screen text carries the lesson; there is no audio narration.
Diagrams simplify the science. Animation timing and diagram dimensions are illustrative, not measurements of live spiders.
Compare gumfoot energy loss →Read the full transcript
- A tangle with a ground connection
This still photograph introduces a western black widow. Its cobweb strategy includes sticky gumfoot lines connecting the supporting web to the ground.
- An attachment designed to let go
In studied cobwebs, gumfoot attachments release more readily than scaffold attachments. A walking insect can trigger this ground connection to detach.
- The energy is already stored
The upper supporting silk holds elastic energy. After release, its recoil can pull the attached insect upward into the web.
- Follow the force through the web
The gumfoot strand connects prey to the support network. The scaffold supplies the spring action; the ground attachment provides the release point.
- One spring represents a whole tangle
Our vertical spring simplifies a three-dimensional web. The cited attachment study supports this strategy, without measuring our western widow model's forces.
- Which lift has less repeated motion?
Keep stored energy and scaffold stiffness fixed. Change only energy loss, replay the release, and compare how the upward motion settles.
Scientific sources and media credits
Latrodectus hesperus — Latrodectus hesperus (F Theridiidae).jpg by Marshal Hedin, CC BY 2.0. Photograph fitted within the video without changing its composition; labels and animated diagrams added around it.
Script, diagrams, animation, and editing: WebTug, September 27, 2026. This video adaptation is available under CC BY-SA 4.0; individual photographs retain their credited licenses.
What the game helps you notice
Gumfoot lines connect a cobweb to the ground. A weak ground attachment can release when prey trips it, letting energy stored in the upper scaffolding lift the prey into the web.
Where does the upward energy come from?
From the preloaded supporting web. The ground attachment acts as a release point; it does not create the energy.
The three lanes, arming button, and recharge timers make a strategy game. The upper spring is a simplified stand-in for a distributed cobweb, not energy stored only in the gumfoot strand.
Try this experiment: How does energy loss change the lift?
Keep stored energy and scaffold stiffness unchanged. Compare two energy-loss settings after the ground connection releases.
Open this experiment and compare A / B →Meet Latrodectus hesperus and explore its research, then use the return link to play again. The challenge scores are game feedback, not measurements of your scientific understanding.
Primary research: Sahni et al., Nature Communications (2012)