The spiders make an unpredictable contribution to the world’s ecosystem. They get rid of harmful insects, protect valuable plants and animals. Their silk also contributes significantly to the military and industrial achievements today.

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Besides these benefits, spiders are also incredibly terrifying creatures and endanger humans when encountered. Here are the 5 most dangerous spiders in the world you need to avoid.

1. The Brazilian wandering spider

The Brazilian wandering spider belongs to Phoneutria keyserlingi, meaning “killer” in Greek. It goes number one on the list of 5 most dangerous spiders in the world today because a small bite of Brazilian spiders can also knock down an adult in just a few minutes.
They live in the canopy of banana trees, so they are also called “banana spiders.”

The size of Brazilian wandering spiders is quite large, with the body length of 5 cm and the distance between the legs is up to 12-15 cm. They are brown and have black spots on their bellies.

They usually work at night, and their favorite foods are insects, other spiders and sometimes small species of reptiles and mice.

When feeling threatened, the Brazilian spiders will bend their legs up high to threaten their enemies.

Due to the strong toxicity, along with the preparation for combat, this spider species is considered quite aggressive. However, it is only self-defense, which attacks only when hunting or feeling threatened.

Image credits: www.mirror.co.uk

2. Black widow spider

The black widow spider with the scientific name Latrodectus mactans lives most in the south of the United States but can be found throughout the western hemisphere.

In this species, the females dominate the size and weight of the body, and they are 2-3 times larger than the male, so it is easy to kill the male after mating – this feature makes it more special and scary compared to spiders in the top 5 most dangerous spiders in the world.

The venom of the black widow is extremely dangerous and 15 times stronger than the rattlesnake. The latrotoxin poison from their bite is a relatively potent neurotoxin that causes vomiting, shortness of breath, delirium, paralysis, and seizures.

3. Brown recluse spider, Violin spider

The brown recluse spiders are found common in the United States.
They are called recluse spiders because they are live in a quiet place like a wardrobe, under furniture or in any outlet.

The symptoms may include itching, fever, nausea, sweat, ulcers in the bite area.

Image credits: authorityremedies.com

4. Sidney funnel-web spider

The Sydney funnel-web spider (Atrax robustus) is a spider species distributed in an area 100 km radius from Sydney, New South Wales, Australia.

Much of the neurotoxin of these spiders is capable of paralyzing the nervous system of animals. But Atracotoxin – the poisoning that the Sydney spiders possess, operates differently.

It is during the process of traveling throughout the body, Atracotoxin increases blood pressure, causing millions of blood bags in the lungs to explode. It is a phenomenon that causes people to suffocate on land.

In fact, this poisoning is harmless to most mammals, but it has a very rapid effect on primates, including humans and it can be fatal for 15 minutes.

Image credits: arachnipedia.wikia.com

5. Redback Spider

The last spider in the top 5 most dangerous spiders in the world is the redback spider.

They are notorious in Australia and spread to other countries like Japan, New Zealand, and Southeast Asia.
They are called redback spiders because they have a red hourglass-shaped mark on the bottom of the belly, so people sometimes confuse it with their black widow spider.

They live in the places where we usually reach for such as our mailboxes, cabinets, floors, and even under the toilet.

Their venom contains a nerve poison that causes vomiting, sweating, headache, chest tightness, and extreme discomfort for 24 hours. The more severe symptoms include seizures, respiratory failure, and even death.
This list of 5 most dangerous spiders in the world only includes the spiders that have been known to be fatal to humans. The exact number of the deaths or venom for each spider is not likely to identify, and therefore the list should be regarded as a primitive ranking rather than an accurate list of deadly spiders.

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