Most Poisonous And Dangerous Spiders In The World

What are the deadliest spiders?

Despite their bad reputation and getting the fury of our flip-flops when they enter the house, spiders are by no means our biggest threats. In fact, around the world, they kill just 50 people . This is nothing compared to the 130,000 deaths caused by snakes or 750,000 from mosquitoes (600,000 of which are from malaria, a disease caused by a parasite that is transmitted by bites).

It is true that there are potentially deadly very poisonous spiders, but they only inject the venom if they feel very threatened. Be that as it may, let’s see which spiders are the most poisonous. We have tried to order them from least to most dangerous.

Goliath Tarantula

The Goliath Tarantula does not have this name by chance. It is the largest spider in the world (adults can measure up to 30 centimeters) and, although one thing has nothing to do with the other, it is also one of the most dangerous.

Present in the rainforests of South America, the Goliath Tarantula is poisonous and deadly to birds and animals of similar size. In any case, it should be remembered that its poison is not, in any case, lethal to human beings. Of course, the bite and the toxic substances produce a deep wound that is accompanied by a lot of pain, nausea, sweating, burning and irritation for several days. It does not kill, but be careful with her, because when she feels threatened, she is aggressive.

Yellow sac spider

Native to North America, the yellow sac spider is one of the most dangerous spiders in the world. Although its bite is not fatal, it can seriously injure the skin. And it is that its venom, which is cytotoxic in nature, kills the cells of the tissues near the bite, causing their necrosis.

Regardless, her diet is based on other insects and even spiders, which may be larger than her. Be that as it may, the problems come because they have a tendency to, although they can live outdoors, grow and reproduce indoors .

Ornamental tarantula

Present throughout the western and eastern parts of India, the ornamental tarantula is another of the most dangerous spiders. Although they are not as big as the Goliath, they can reach 25 centimeters. There are hundreds of different species, although all of them have a powerful toxin that, in case of biting a person, does not cause death, but it can induce, in some cases, coma .

The ornamental tarantula stands out for not capturing its prey (flying insects) by means of fabrics, but by pouncing on them. It is one of the few spiders that actively hunts.

Wolf Spider

The wolf spider, named for its aggressive behavior when hunting, is one of the most dangerous in the world. Anyway, it tends to flee from large animals (including us, of course) and its bite is not fatal, but it can lead to potentially serious infections .

Chinese bird spider

The Chinese bird spider, as can be deduced from its name, inhabits the tropical forests of both China and Vietnam. Despite its name, this spider does not eat birds, but insects and small rodents.

It is not fatal (if treated), but its powerful neurotoxins have caused episodes of severe nerve damage and even post-bite physical and mental disabilities in some cases .

Mouse spider

Native to Australia and New Zealand, the mouse spider is one of the most dangerous in the world. It doesn’t measure up to 4 centimeters, but watch out for it. It has one of the most interesting hunting methods in the animal world, as it forms burrows with a kind of “caps” and, when it detects movement, it opens it and captures its prey.

The bite in humans, although not fatal, it is extremely painful and is usually accompanied by involuntary muscle contractions, sweating, tingling in the mouth, numbness, nausea, vomiting, etc.

Chilean recluse spider

Present in Chile, Argentina, Peru, Ecuador, Uruguay and southern Brazil, the Chilean recluse spider, with its little more than 2 centimeters in length, is one of the most poisonous in the world. Its cytotoxic venom causes necrosis (cell death) of the tissues near the bite, causing a life-threatening gangrene .

It has been observed that this spider can even cause kidney failure, that is, seriously damage the kidneys. Even with treatment, there are times when it results in death.

Redback spider

Originally from Australia, this small spider (just over 40 millimeters long), which is believed to be a close relative of the famous black widow (which we will see later), has a very powerful venom that acts with a different intensity on each person, which is still under study.

In milder cases, a bite from this spider is accompanied by swollen lymph nodes, nausea, and headaches so severe that they seem like migraine episodes. But it is that the most serious cases can be accompanied by seizures, respiratory failure , coma and even death.

Wanderer spider

The hobo spider, also known as the Hobo Spider, is a very small spider (maximum 15 millimeters) that inhabits different regions of Europe, Asia, the United States, Canada and southern Alaska. Its bite is very dangerous since the toxin, although not usually fatal, causes, in addition to severe headaches, the necrosis of nearby tissues, leaving scars with a very bad appearance for the rest of life. Despite not being lethal, its necrotic effects and its great variety of habitats make it one of the most dangerous in the world.

Black widow

Surely the most famous on this list. Originally from North America, the black widow, which receives this obscure media name because the females, after mating, eat the males to ensure a good laying, is one of the most poisonous spiders in the world.

But its effects on humans are still horrible, because an untreated bite (there is an antidote) from this spider causes neurotoxic effects, leading to muscle spasms and even cerebral palsy . It is not generally fatal, but it can kill children and the elderly.

Funnel web spider

Also known as the Sydney spider (it hails from Australia), the funnel-web spider is one of the most poisonous in the world. It stands out for being one of the spiders that injects the highest dose of venom with each bite (it is very aggressive and bites repeatedly), making it extremely dangerous, especially for children and the elderly.

It is so poisonous that its toxin, with a neurotoxic effect (attacks the nervous system), can cause death from generalized muscle paralysis in children in just 15 minutes . In adults, although not usually fatal, it causes an extremely painful wound that is accompanied by nausea, vomiting, muscle spasms and general fatigue.

Brown recluse spider

The brown recluse spider, also known as the corner spider or fiddler spider, is one of the most poisonous and dangerous in the world. And it is that in addition to having a powerful poison, it has a predilection for inhabiting dark areas of houses, such as the corners behind furniture or the part behind paintings.

In addition to this, its toxin expands very quickly after the bite, and can cause death in a matter of an hour . All this makes it stay with the third place.

Six-eyed sand spider

The six-eyed sand spider has the “honor” of being the second most poisonous spider in the world. Native to South Asia and the African deserts, this fearsome creature, despite its powerful venom, is not aggressive unless it feels highly threatened.

Keep in mind that there is no antidote, so you have to be especially careful. These spiders camouflage themselves in the sand (hence the name) waiting for prey to pass by. However, we may unknowingly (you can hardly see how well camouflaged she is) we make her feel threatened, at which point she may bite us.

In addition to having no antidote, its symptoms are surely the most horrible on this list. A bite from the six-eyed sand spider can cause, in addition to necrosis, internal and external bleeding. And it is that its toxin induces blood clotting, which causes blood clots to form that can lead to death.

Brazilian wandering spider

Few spiders can say they are worthy of a Guinness record. But the Brazilian wandering spider can, as it has the title of “most poisonous spider in the world”. Also known as the banana spider, it is native to Brazil and other South American countries.

Its neurotoxin is so powerful and injects such an amount (more than any other in proportion to size), that it causes rapid suffocation and, consequently, death. In addition, they are very aggressive and easily recognizable because when they feel threatened, they raise their front legs.

As shocking data, it should be noted that in men, the neurotoxin causes painful erections (in fact, its venom is being studied as a possible treatment for erectile dysfunction). In 2013, a family in London had to leave their home and fumigate it because they bought a bag of bananas from Brazil and, when they opened it, hundreds of spiders of this type fell, something that had not been detected in any of the production phrases or Of transport.


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