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The Sydney funnel-web spider, Atrax robustus, is a notoriously dangerous Australian funnel-web spider usually found within a 100-km radius of Sydney, Australia.The Sydney funnel-web spider is one of the most dangerous spiders in the world and will defend itself aggressively if threatened or frightened. For this reason, humans are strongly advised not to approach them. Chances of being bitten are high if encountered, and bites can be lethal within 15 minutes if not treated.
The brown recluse spider or violin spider, Loxosceles reclusa, is a well-known member of the family Sicariidae, highly venemous, causes necrosis.
Latrodectus hesperus, the Western black widow spider or Western widow, is a highly venomous spider species found in western regions of the United States of America.
The Mexican Red-kneed Tarantula (Brachypelma smithi), is a species of burrowing tarantula native to the western faces of the Sierra Madre Occidental and Sierra Madre del Sur mountain ranges in Mexico.
The golden silk orb-weavers (genus Nephila) are a genus of spiders noted for the impressive webs they weave. Nephila consists of numerous individual species found around the world. They are also commonly called golden orb-weavers, giant wood spiders or banana spiders. In North America, the golden silk orb-weavers (see also Nephila clavipes) are sometimes referred to as writing spiders due to occasional zigzag patterns (stabilimenta) built into their webs, though these occur much more frequently
The Brazilian wandering spiders are a genus of aggressive and highly venomous spiders found in tropical South and Central America. These spiders are members of the Ctenidae family of wandering spiders.