Shudder action buys time for male spider from being killed

(Phys.org) —Stated in scholarly terms, a newly published study says research results suggest that "male web-building spiders employ a phylogenetically conserved vibratory signal to ameliorate the risk of pre-copulatory cannibalism." Translation: A smaller and weaker male spider needs to rock the web so that the female spider won't kill him before mating.

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