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A capture device on one line. This still photograph introduces Mastophora hutchinsoni. Hunting females use a silk line ending in an adhesive droplet: the bolas.

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Bring the target within reach. The spider releases chemical signals resembling female moth pheromones. Male moths approach, bringing a flying target close to the sticky droplet.

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The spider supplies the flick. An active leg movement sends the bolas toward the moth. The line and droplet stretch as the capture device accelerates.

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The glue changes shape. During contact, the adhesive spreads into the moth's scales. The deformable droplet and silk help manage the struggling prey's motion.

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Simplify one part of the motion. Our lab uses a passive pendulum baseline. It leaves out active flicking, chemical attraction, silk extension, and glue deformation.

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Which line swings more slowly?. Keep swing energy and loss fixed. Compare short and long lines; count swings over the same interval before explaining your prediction.