The 15 most poisonous animals in the world


Have you ever wondered what they are the 10 most poisonous animals in the world? On the planet earth there are hundreds of animals that can be lethal to man, although in many occasions the potential or the effects of his poison are unknown.

Remember that for animals to inject poison is an effort, a loss of energy and even a recovery time in which they are vulnerable, they do not attack because.

Even if it is a defense mechanism, poison can seriously affect you and lead you straight to deathFor this reason we recommend that you continue reading in ExpertAnimal about this ranking of the 10 most poisonous animals in the world.

10. Scorpio

In the tenth position we find the name scorpion. There are more than 1400 species distributed all over the world and they adapt perfectly to different climates and food.

Because they are an easy target for owls, lizards or snakes, the scorpion developed several defense mechanisms, although the most striking is the stinger. Most do not pose a risk to humans, although some, such as those belonging to the family Buthidae, are extremely dangerous.

They inject a neurotoxin so potent that death can occur in a few 5 or 6 hours.

9. Brown Recluse Spider

In position number nine we find the brown recluse spider as one of the 10 most poisonous animals.

Also known as Loxosceles laeta This spider can be deadly according to the mass of the individual and if not, its venom acts by dissolving the tissues of the skin while causing a cell death that can end in amputation. The effect is 10 times more powerful than sulfuric acid.

What can you do if a brown recluse spider bites you?

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8. Black Widow Spider

The famous black widow spider appears in the position number eight of the list. Its name is due to cannibalism, particular of its kind, since the female eats the male after the pairing.

It is the most dangerous spider for humans, especially females, and indicates it with red marks that decorate their black body. Its effects can be serious and even fatal if you do not go to a medical center to receive proper treatment.

7. Black Mamba

The Black Mamba It is a snake known to all, it makes its appearance even in Kill Bill. It is considered the most poisonous snake in Africa and the color of its skin can vary between green or metallic gray. It is fast and very territorial. Before attacking, it emits warning sounds. Its bite injects about 100 milligrams of poison, and 15 milligrams are lethal to any human being.

6. Blue Rings Octopus

Their rings should already warn us of their danger. He blue rings octopus It is the most dangerous cephalopod on earth since there is no antidote for the poison it carries, enough to take the lives of 26 people. They are very small but have a powerful and deadly poison.

5. Arrowhead Frog

The arrowhead frog It is also known as Golden Dart Frog. It is the most poisonous amphibian on planet earth as it exudes poison capable of killing 1500 people. Formerly the natives dipped the tips of their arrows with the poison, which made them more lethal.

4. Taipan snake

The effects produced by taipan snake They are scandalous, can kill 100 adults as well as 250,000 mice. Its venom is between 200 and 400 times more toxic than most rattlesnakes.

The neurotoxic action makes it possible to kill an adult human in just 45 minutes, which makes it essential to go to a medical center as soon as possible.

3. Stone Fish

He stone fish is the actinopterygium most poisonous in the world, the name appears precisely because of its appearance, similar to a rock. The contact with the spines of its fins is mortal for the human being since its venom is similar to that of a cobra. The pain is very intense and distressing for those who suffer from it.

2. Marine Snake

The sea ​​snake It is present in any sea on planet Earth, its poison being the most harmful of all snakes. It exceeds 2 to 10 times that of a cobra and its bite is lethal to any human being.

1. Sea wasp

The sea ​​wasp or box jellyfish is undoubtedly the most poisonous animal on the planet. It inhabits mainly in the sea near Australia and can have tentacles of up to 3 meters in length. As they age their venom becomes more lethal, being able to kill a person in 3 minutes.

If you want to read more articles similar to The 10 most poisonous animals in the world, we recommend that you enter our Curiosities section of the animal world.

Some animals give us an unmerited fear Juan Armando Corbin

There are many people who experience fears or phobias towards different animals or insects, for example, arachnophobia or spider phobia. Occasionally, this fear is caused by the appearance of some of these specimens, such as their large teeth or their rare appearance.

However, there are animals that we should fear and that we should flee as soon as possible, Well, his poison can be lethal. Animals that apparently could be harmless, but that hide toxins capable of producing an agonizing death.

15. Sea snake beak

Generally, when we think of a snake, we imagine the typical terrestrial reptiles like the cobra or the python. But nevertheless, there are also sea snakes They are able to end the lives of humans in a matter of minutes, for example, the sea-nosed snake or "Enhydrina schistosa", which is found in Southeast Asian waters.

It can measure up to 1.5m, and feeds mainly on catfish, although it can also ingest puffer fish and occasionally other fish or squid species. With just 1.5 milligrams of poison a person can end life. This species can kill humans frequently by coming into contact with fishing nets.

14. Black Widow

The black widow is one of the most popular and most famous spiders for its danger. It belongs to the genre Latrodectus, which contains 31 species recognized as poisonous spiders, this being the deadliest. These spiders receive this name because after mating they eat the male. In some cases it manages to escape.

Black widows are usually very lonely, cannibal and nocturnal spiders. They only show social interest when they mate, although later they kill the male. Its venom paralyzes the central nervous system and produces intense muscle aches. There is an antidote called Aracmyn that neutralizes the poison in 15 minutes.

13. Sydney Spider

The Sydney spider is one of the deadliest in the world. It has large fangs and pockets full of poison. Males grow up to 25 mm long while females grow up to 35 mm. They are considered as one of the most poisonous species on the planet, and their bite causes hyperthermia and acute fever, severe muscle aches and cardiorespiratory arrest that causes the death of the victim.

12. Armadeira spider

The Brazilian armadeira or wandering spider (or banana) is one of the most poisonous in the world. It is a fairly large arachnid species. It is also very aggressive, and while most spiders flee when faced with a predator, it faces its enemies. It is located in South America, specifically in Brazil, and its sting is lethal, because it causes tachycardia, muscle pain, nausea and vomiting, sweating, blurred vision ... It can kill in less than half an hour.

11. Marble shell snail

Few may think that a snail is capable of killing, but the poison of the marbled shell snail is one of the deadliest. It is found mainly in the Indian Ocean, and a drop of poison from this snail can kill up to 20 adult humans. He usually uses his poison to catch his prey and rarely has contact with humans. The poison can cause loss of coordination, shortness of breath, heart failure, double vision, coma or death. there is no antidote against its sting

10. Royal Cobra

The cobra is one of the best known snakes, largely because of its characteristic posture when placed in an attack position, and reaches a great height. It is originally from Asia, specifically from Thailand. It is one of the largest venomous snakes, and its bite contains a large amount of neurotoxins, and it is very painful. In addition, their size makes these reptiles can bite a great distance.

9. Puffer fish

The puffer fish It may seem harmless, but it is very dangerous. It is found in the waters surrounding Japan, China and the Philippines and Mexico, and contains a toxin known as tetrodotoxin that produces a number of effects for people: nausea, headache, speech and coordination problems, seizures, paralysis, arrhythmia Cardiac and even death. The puffer fish, despite being poisonous, is also edible.

8. Arrowhead frog

Frogs are animals that don't seem to be able to kill a human being. Some of these frogs also have bright colors, so they are really exotic. But far from this nice picture, they also contain toxins. These types of frogs inhabit South America and Central America, and the venom secreted by their glands is called batrachotoxin, a toxin blocks nerve signals to the muscles, causing paralysis and death.

7. Taipan snake

Snakes are one of the most feared animals, because many of these reptiles are poisonous. One of the most dangerous is the Taipan snake, because its toxins are lethal. Lives in Australia, and his bite can kill a person in less than 45 minutes. Luckily, it has an antidote.

6. Black Mamba

Another snake on this list, and the deadliest. The black mamba is found in Africa and usually measures about two and a half meters, although some specimens can reach four meters. The inside of his mouth is black, so he receives this name. It is the fastest snake on the planet, and can reach speeds of 20 km / h.

5. Stone fish

The stone fish is one of the strangest fish, and a species with which people should go carefully. It is camouflaged at the bottom of the sea and can be confused with rocks. Its toxins cause swelling, paralysis and death. There is an antidote for this substance, but it is necessary to act quickly.

4. Death Worm

The death worm is a caterpillar called obliqua lonomia, which is located in Brazil, although it can be found in other areas of the Amazon. Cases have also been reported in Argentina. When a person comes into contact with the caterpillar, the discomfort begins, similar to food poisoning, followed by a severe headache. At 8 hours it is possible to notice the presence of bruises, and within days the person dies due to internal bleeding.

3. Octopus with blue rings

This animal does not have a large size, it measures the same as a golf ball. But this tiny octopus is very poisonous, and it's practically of the deadliest species we can find in the sea. They are found in Australia, Japan, Indonesia, the Philippines and New Guinea. The venom of this animal can cause blindness, nausea, paralysis and respiratory failure, as well as death.

2. Sea wasp

The sea wasp has nothing to do with the land wasp. It is a huge jellyfish which can reach up to 3 m long and weigh 2 kg. It has between 40 and 60 tentacles filled with poison that are capable of ending the lives of individuals who cross their path. Inhabits Australian waters.

1. Golden dart frog

The most poisonous animal in the world is the golden dart frog. It has a peculiar and attractive color, but minimal contact with this frog can cause death. In fact, there is no need for the amphibian to be present, since the toxin is still active outside. Cases of dead dogs have been reported after coming into contact with some surface on which the frog had perched. It can produce up to 28 grams of poison through the skin, capable of killing 1500 people.

Brown recluse spider

The next in this list of Top 10 most poisonous animals in the world we also found an arachnid, in this case, the brown recluse spider. This spider is also distributed throughout much of the planet, however, mainly found in South America, especially in Argentina and Chile.

If it is on this list it is because its sting can cause severe reactions, reaching cause the death of the person Depending on your body mass. The fact is that despite the fact that in the first hours it does not cause any type of pain, its venom is slowly entering, causing skin lesions, necrosing the flesh and sometimes causing the need for amputation.

Like most spiders, the brown recluse spider only bites if they feel attacked, so if you encounter a specimen, the best thing you can do is get away without disturbing it.


Scorpions are surely one of the most emblematic poisonous animals and deserve to be in this ranking of more poisonous species. There is not a single scorpion, but on the entire planet we can find almost 1500 different species, adapting to all types of climates and latitudes.

Similarly, not all scorpions are equally poisonous, there are some with more potent poisons What others. Some types of scorpion, in fact most, do not pose any danger to humans, however, there are some species like the Buthidae, with a poison so potent that it can kill a person in less than 6 hours.

Scorpions, during their evolution, have developed a complex stinger capable of removing poison when they nail it. This sting serves as a defense in front of their biggest predators, snakes, lizards and owls.

Golden arrowhead frog

Among the 5 most poisonous animals in the world we find this picturesque amphibian that receives many names, poison golden frog, poison dart frog or golden dart frog. Its scientific name already tells us a lot about its characteristics: Phyllobates terribilis.

These animals live on the Pacific coast of Colombia and Panama, in the humid forests and warm forests with high rainfall density. The golden frog is not only the most poisonous frog in the world, it is the most poisonous vertebrate on the planet, a single dose would be enough to end the life of 1,500 adults.

Its effects do not go unnoticed by the inhabitants of these areas, the indigenous tribe used the poison of these frogs to spread your arrows with him and hunt.

But not everything is death, recently scientific studies have investigated possible medical uses of the poison of these frogs and the result has been that it is possible to create a powerful analgesic by isolating some of the effects that these toxins produce.

Belcher sea snake

Belcher's sea snake is another of the most poisonous animals that deserved to be on this list. Not only is the most poisonous sea snake, if not that it is also if we consider the terrestrial ones. Its venom is so potent that it exceeds more than 100 times the most potent venom of any terrestr snakeand. But calm, despite the fact that a few milligrams of their poison could kill hundreds of adults, the reality is that this snake bites little, and when it does it does not usually release all the poison. That is why only 1/4 of the people attacked by these snakes are going to be poisoned.

Of course, after poisoning, if your antidote is not administered, after 20 minutes and up to 8 hours after the bite, the person will begin to feel dizzy, weak, convulsions and will cause death. The ancestors of these snakes are the Australian terrestrial ones and, they are very similar to any land snake, only that it has small adaptations to the marine environment, where it can pass up to 8 hours without surfacing.

Your size can go from half a meter to three meters of some individuals. Its food is based on seafood and fish and its habitat is that of warm waters or tropical seas, that is why it is only found in Oceania and in Southeast Asia.

World's most poisonous animal: box jellyfish

And finally we come to the top of the most poisonous animal in the world. Like others in this top 10 it is also marine, but although it may surprise many it is a jellyfish. The wasp jellyfish or box jellyfish It is so lethal that, when its presence is alerted in areas near the coast, the bathroom is strictly prohibited. Its natural habitat is Australia and its coasts.

Its appearance may seem small, about 25 centimeters, however, with open tentacles they can reach up to 3 meters long, with a weight that can exceed 2 kg. But what really stands out about this animal is its powerful poison and its lethal sting.

They do not need a large amount, just 1.4 milligrams are able to kill an adult, since this poison is capable of attacking the entire nervous system of the victim, paralyzing it in the midst of terrible pain and collapsing the heart, nervous system and circulatory. If you want to survive it is necessary to receive immediate medical attention, however, since the bites occur in the sea, many times the person die before reaching the shore.

If you want to read more articles similar to What are the most poisonous animals in the world, we recommend that you enter our category of Curiosities of animals.

A drop of poison from some snakes can kill up to a hundred people and it is enough to touch a certain frog to lose the v>

A drop of poison of some types of snake can kill up to a hundred people and it is enough to touch a certain species of frog to lose its life. The poisonous animals they are those that use substances with temporary or permanent harmful effects, even lethal, through a chemical mechanism. However, the fact that many animals possess a deadly poison does not mean that they are aggressive or dangerous to humans.

Toxic chemicals change drastically from one animal to another, just as the response of the poisoned subject varies. There is a test that measures the degree of poisonousness of an animal, the LD50 (Lethal Dose 50), which measures how much venom of the animal studied is necessary to reduce the population of laboratory rats by half in 24 hours. Obviously, a human reacts differently to that of a guinea pig and often the amount of poison emitted by the animal is more decisive than its toxicity. Therefore, it is not possible to establish a real classification, because the factors to be taken into account and the variables are too many.

Snakes, the image of danger

In the popular imaginary, the stereotype of venomous animal is the snake. The composition of the different poisons can cause a wide variety of symptoms and in reality only about 15% of snakes possess a dangerous poison for humans.

Boomslang snake | Getty

In Australia at least eighteen dangerous species can be found for humans and it is also the home of the snake with the deadliest poison of all: the interior taipan (Oxyuranus microlepidotus), which can reach a length of three meters. Its poison is fifty times more potent than that of a common cobra and the amount present in a single bite is enough to kill about a hundred people. Despite the power of their poison, they only attack when they are threatened, as they are a bit shy.

He boomslang (Dispholidus typus) is the most poisonous snake in Africa. It is a reserved animal that usually does not tend to attack humans. It has a poison that contains an anticoagulant that causes unstoppable bleeding. However, the amount of toxic substance introduced by the bite in this case is minimal.

It also deserves a mention among snakes the cobra black collar spittoon (Naja nigricollis), more unique than rare among poisonous snakes, since it has the ability to spit its venom from a distance, with an action beam of approximately one and a half meters. They live in central and southern Africa.

Eight-legged killers

In Australia we also found the spider red back (Latrodectus hasseltii). Its venom is composed of neurotoxins capable of causing serious damage to the human body, even leading to death if it is not intervened with an antidote. Mortal bites are inflicted only by female specimens, which are larger and survive four times longer than males.

Red back spider | Getty

According to the Guinness Book of Records, however, it is the banana spider (Phoneutria) from Brazil, Venezuela, Peru and Costa Rica, the world's most poisonous arachnid. A drop of its poison is enough to kill a person. What makes it a real threat to human beings, is the fact that he likes to hide inside houses, in cars and even in shoes. Its sting produces a cardiorespiratory paralysis and in men causes a prolonged and painful erection, so it is also known as viagra spider.

Yellow and lethal frogs and scorpions

In the Center and South America also lives the dart frog or Golden Frog (Phyllobates terribilis). This type of amphibian can be of different bright shades: yellow, blue, green and red. It does not inject poison with the mouth, but through the skin: simply touching it can cause death due to respiratory failure, or cardiac fibrillation. This frog of only 2.5 cm throws small poisoned darts that can kill about ten people at a time. The batracotoxin present in the amphibian is the most poisonous animal substance in the world and some natives use it for hunting, covering the arrows with this toxic element.

The golden frog, the attractive and lethal amphibian | Getty

The yellow scorpion or Palestinian yellow scorpion (Leiurus quinquestriatus) is very aggressive and is mainly found in North Africa and the Middle East. Each year is the cause of more than 75% of deaths related to scorpion sting, especially among children who die almost immediately from suffocation. Deathstalker, as it is called in Anglo-Saxon countries, has a neurotoxin capable of damaging the cardiovascular and respiratory systems.

Poison under the sea

When we descend to the deep sea we find many examples of very poisonous animals. One of the deadliest of all is the so-called sea ​​wasp (Chironex fleckeri). This type of jellyfish lives in the tropical and subtropical oceans and has caused the death of more than 5,000 people since 1954. Its venom irremediably affects the heart, skin and nervous system, even being able to harm even a large group of swimmers in A few minutes. Although there is an antidote, some of the people who come into contact with their poison do not survive.

This lethal jellyfish, known as sea wasp, can kill with its touch | Getty

The only known substance capable of progressively deactivating the toxic substances contained in the jellyfish venom is vinegar. Therefore, in the Australian coast you can find bottles of vinegar to intervene immediately in case of contact.

He Blowfish (Tetradontidae), also known as a king dish in Japan and Korea, contains tetrodotoxin, a neurotoxin that affects the respiratory system, causing an almost instantaneous death. The preparation of their meat requires a skill dominated by very few cooks and eating it, for the Japanese, is a great act of courage.

He blue rings octopus (Hapalochlaena lunulata) He lives in the Pacific Ocean and can kill more than 25 people with his poison in a few minutes. The animal measures only five centimeters and its tentacles can reach seven. The toxin that it emits is the same as that of puffer fish, but in much higher quantities.

Blue hoop octopus | Getty

He stone fish (Synanceia Verrucous) is widespread in the salty waters of the Pacific Ocean and the Red Sea. He rests mimetized at the bottom of the sea, about thirty meters deep, waiting for his prey, and to which he attacks with fourteen thorns placed on his back. It can reach a maximum length of 40 centimeters and its venom is milky. If not treated immediately, the sting is deadly.


Aggressive Chinese red-headed scolopendra (Scolopendra subspinipes mutilans) has an armored, flattened and elongated body that can have 300 legs. It is terribly fast and aggressive, and normally attacks every living creature that is in its path. But the most terrible thing about this insect is its ability to inoculate the powerful "spooky Ssm toxin", which for the heart of crickets, worms, snails, toads, small lizards and snakes or even rats, mice and bats, since it has the capacity of killing animals up to 15 times larger than her.

With a poison able to kill 60 people, the sea ​​wasp or box jellyfish (C. fleckeri) that lives on the coasts of Australia kills at least one person every year. Symptoms after picaudra of this striking and deadly jellyfish include vomiting, nausea, diarrhea, chills, sweating and widespread pain.

He Gila monster (Heloderma suspectum), who lives in the southwest of the USA. and northwestern Mexico, is the most toxic lizard in the world. Its venom injected intravenously in mice has the same toxicity as the sumatra spit cobra. In fact, the average dose of its poison is capable of kill 50% of laboratory animals. However, it does not inject the poison, but instead filters it into the wound by biting the victim. Few people have died from their bite, since there is little poison that goes through the wound.

Komodo Dragon - Efe

As for large poisonous lizards, the Komodo dragon (Varanus komodoensis) is the largest of its kind. In 2009 it was discovered that it has two glands in the lower jaw that secrete a poison composed of several toxic proteins. On average, it measures about 2.59 meters and weigh between 80 and 90 kilos.


With a single attack, the indoor taipan (Oxyuranus microlepidotus) is able to inoculate both poison and to kill 50 adults in 45 minutes for its neurotoxic action. With residence in Queensland, New South Wales and South Australia, it is the most poisonous land snake in the world.

Snake Dubois - Rick Stuart-Smith,

On the aquatic level, however, the toxic queen is the Dubois snake (Aipysurus duboisii), which usually inhabit the shallow waters of the coral reefs of Papua New Guinea, New Caledonia and the coastal areas of Australia.

One of the few known poisonous birds lives in Papua New Guinea: hooded pitohui (Pitohui dichrous). Although known before, it was in 1990 when scientists discovered that both their skin and their feathers contain the neurotoxin call homobatracotoxin, which causes pain just by touching it. This bird acquires the poison from its diet, mainly from the same beetle that also makes Colombia's frogs toxic.

There are several subspecies, but the color is related to the danger: the greater the color, the more poison. Local tribes know him as «garbage bird», Because they can't eat it.

He Synanceia Horrida, a kind of stone fish that lives in the tropical waters of the Indian and Pacific is the pex that has the largest venomous glands: only 25 micrograms of its poison can kill an adult of 70 kilos.

Pufferfish - ABC

But there are also fish that are toxic if ingested, such as Blowfish (Nobilian torpedo), which lives in the Red, Indian and Pacific Sea. Your ovaries, eggs, blood, liver, intestines and skin contain tetrodotoxin, a potent neurotoxic that block the diaphragm muscles, finally producing respiratory failure. However, when ingested, its effects take time to manifest.

With a lethal neurotoxic after a few minutes, the blue-ring octopus Hapalochlaena Maculosa Y H. lunulata They are the most poisonous mollusks. These animals, which live off the coast of Australia and in some areas of Southeast Asia, each have both poison and paralyze ten adults.