WEBVTT

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A tangle with a ground connection. This still photograph introduces a western black widow.

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A tangle with a ground connection. Its cobweb strategy includes sticky gumfoot lines connecting the supporting web to the ground.

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An attachment designed to let go. In studied cobwebs, gumfoot attachments release more readily than scaffold attachments.

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An attachment designed to let go. A walking insect can trigger this ground connection to detach.

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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.

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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.

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One spring represents a whole tangle. Our vertical spring simplifies a three-dimensional web.

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One spring represents a whole tangle. The cited attachment study supports this strategy, without measuring our western widow model's forces.

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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.