Spiders (order Araneae) are air-breathing arthropods with eight legs and chelicerae with fangs able to inject venom.
Although spiders are widely feared, only a few species are dangerous to people.
Spiders will only bite humans in self-defence, and few produce worse effects than a mosquito bite or bee sting. Most of those with medically serious bites, such as recluse spiders (genus Loxosceles) and widow spiders (genus Latrodectus), would rather flee and bite only when trapped. However, this can easily arise by accident.
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