Nearly all spiders use venom to immobilize or kill their prey, and can thus be considered venomous. However, very few species are dangerous to humans. Of the more than 51,500 known spider species, fewer than 30 have been implicated in human deaths. Most spider venom is adapted to subdue small animals, particularly insects, and has little effect on humans. Although some species can cause serious reactions, deaths from spider bites are extremely rare.
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