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> How did this develop? If it stuns or kills insects on the web, what protects the spider itself?:
> 
> https://www.sciencenews.org/article/spiders-poisonous-webs-neuro-toxins-genes
> 
> "Orb weaver spiders are known for their big, beautiful webs. Now, researchers suggest that these webs do more than just glue a spider’s meal in place — they may also swiftly paralyze their catch.
> 
> "The idea first came to him about 25 years ago, when Palma lived near a rice plantation where orb weavers were common. He says he often saw fresh prey, like bees or flies, in the spiders’ webs, and over time, noticed the hapless animals weren’t just glued — they convulsed and stuck out their tongues, as if they’d been poisoned. If he pulled the insects free, they struggled to walk or hold up their bodies, even if the web’s owner hadn’t injected venom.
> 
> "Palma had worked with neurotoxins for many years, and these odd behaviors immediately struck him as the effects of such toxins.
> 
> "The pair and their colleagues analyzed the active genes and proteins in the silk glands of banana spiders (Trichonephila clavipes) — a kind of orb weaver — and found proteins resembling known neurotoxins. The neurotoxins may make the webs paralytic traps, the team reports online June 15 in the Journal of Proteome Research. The prey-catching webs of other species probably have similar neurotoxins, Palma says.
> 
> "These neurotoxin proteins also showed up on the silk of webs collected in Rio Claro, packed into fatty bubbles in microscopic droplets on the strands. And when the researchers rinsed substances from webs and injected them into bees, the animals became paralyzed in less than a minute.
> 
> ***
> 
> "Paralytic toxins may be just part of the underappreciated complexity of web design. Palma plans to have his students dive deeper into smaller, as of yet unidentified proteins his team found. He thinks they may help keep the prey alive until the spider’s ready for a fresh meal."
> 
> Comment:   An  insect cannot develop a toxin by trial and error and survive. Designed by God.