When you look at general classes, the orb-weaving spiders have stickier webs than deinopoid spiders, which, like ancestral spiders, use a dry adhesive on their webs rather than a wet, sticky one. Among orb-weaving spiders, though, stickier isn’t always better. If an insect gets stuck in a web that clings to it no matter what, it might break the strands themselves in a struggle to get away. If they’re a little less sticky, though, the insect might free itself from one strand only to get caught by another. Researchers have found that the force needed to free something from an orb-weaving spider’s web varies from 20% to 70% of the force needed to break the web.
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