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  3. John Morales says

    devnll, cf. https://en.wikipedia.org/wiki/Pholcus_phalangioides#Predation_behaviors

    The primary defense strategy performed by P. phalangioides in moments of predation is whirling. Whirling, or a gyration of the body, consists of the spider swinging its body around in a circle repeatedly while its legs remain fixed on the web.[18] This whirling strategy is induced as soon as the individual recognizes any sort of movement occurring in its web. The duration of this whirling is related to the specific kind of predator that the spider encounters. Short-duration whirling can be induced simply by a human touching the spider’s web or occasionally by spider of a different species.

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