The black widow is the most common poisonous spider in the U.S.
In terms of venom, the world’s most poisonous spider is the Brazilian Wandering spider from the Amazon rainforest. These are very large, agressive spiders that stand on their hind legs and raise their front legs to appear bigger, and they have an extremely painful bite that can be fatal if left untreated. Brazilian Wandering spiders can grow to 4-5 inches, including their leg span, which is about the size of a taranchula.
The Redback Spider from Australia is considered one of the most dangerous spiders in the world. Redback spider bites cause severe pain at the site of the bite and cause other symptoms that include: sweating, muscular weakness, vomiting, and nausea. Although the toxic venom transferred during a bite is deadly, there have been no reported deaths since the release of the anti-venom. Over 250 bites receive antivenom treatment each year, although there are probably many more cases that go unreported.
One of the most dangerous spiders would have to be the Brazilian wandering spider. This spider is considered the most venomous species of spider. The neurotoxin produced byt his spider causes loss of muscle control and breathing problems, resulting in paralysis and eventual asphyxiation. It also causes intense pain and inflammation and uncomfortable erections that can last for years which can lead to impotence. The reason why this spider has a reputation for being very dangerous is because they are commonly found in highly populated areas of south eastern Brazil. Because of their wandering nature, they tend to hide in dark places during the daytime, leading it to hide within houses, clothes, cars, boxes thus generating accidents when people disturb it.
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