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Which are the 10 most dangerous animals in the world?

Updated on August 15, 2013

Dangerous animals ! Get to safety



Did you know that a snake who loves the taste of mice can inject during a single bite enough venom to kill 125 rodents?

An animal which relies on physical strength will kill their prey by crushing his skull or tearing it's neck. Knowing this, we can say that people are weak. Almost any animal of our size could easily kill us during combat. As a result we protect ourselves as much as we can from the dangers of the nature by using technology. Most times we fail at guarding ourselves against the dangers of the wild, but from time to time, accidents occur and those results are not exactly in our favor.

Every year, the world records several hundred of such accidents where people are injured or killed by wild animals. In reality, the number of casualties would likely be higher if certain species of "attackers" wouldn't be rare or living in less accessible areas.

The following list represents the 10 most dangerous animals from the entire world.Although you will not find it in the list below, I decided to mention here the Nile crocodile, which kills approximately 320 individuals and tigers which, from the nineteenth century and up to now they have been guilty of causing about 373,000 deaths.

Sea Wasp


10. Sea Wasp - Chironex fleckeri

With a body about 30 inches and tentacles that often reach 3 meters, this jellyfish is the largest from it's family. Originally from the waters around Australia, it feeds mainly on shrimp and small fish, catching them with venom.

For humans, the jellyfish venom causes a loss of potassium molecules from the red cells. As a result of this action, the electric signals that allow muscles to contract are disturbed and as an effect, the heart stops beating. Specifically, this jellyfish venom works similarly with the lethal injection used by some states for capital punishment.

During certain times of the year these animals storm the shallow waters of the coast. Because they are transparent, there is a good chance for individuals who swim to touch by mistake such a creature. Once stung, the victim often drowns before reaching the shore. In some cases, those who succeed in escaping from the water and got the antidote, still didn't survive the attack.

On average, a jellyfish like this has 60 tentacles, each tentacle has itself around 500,000 pins which emit venom. Once the victim is injected, it has only about 2-5 minutes to live. In these circumstances, it is understandable why 40 people are killed annually by the sea wasp.

Aggressive domestic dog


9. Domestic dogs - Canis lupus familiaris

For more than 30.000 years, people have lived in communion with these animals. However, each year in the U.S. alone, approximately 4.7 million people are bitten by dogs while 26 of them are killed. In most cases, the victims are children and the elderly.

Lethal attacks are made, most of the time, by large dogs, like boxers or rottweilers, because they attack their "prey" by bouncing and biting the neck. Globally, dogs kill about 100 people, at least 20 times less than wolves do.



8. Cassowary - Casuarius casuarius

With a height of 1.7 meters and a weight estimated at about 80 pounds, this is the second heaviest bird on earth, after the ostrich. It iss also the only bird known to attack and kill people.

Data about the attacks appeared in Queensland, Australia, and as far as we know so far, there was found the the first man killed by a cassowary.

The species is distinguished by the blue neck and the bony crest from the head of the bird, often used to stab the victims. However, the most dangerous weapons are the claws of this animal, with a length of about 12.5 cm. The middle finger claw is like a knife, and the bird does not hesitate to use this weapon in combination with the ability to jump 1.5 meters to attack individuals who seem to threaten them.

There have been cases where with a single blow, cassowary birds cut people's throats.



7. Mosquitoes of the Anopheles species

Measuring approximately 15mm, a Anophele gambiae mosquito is 12,000 times smaller than a human. In his mouth, there is a protozoan organism that is 144,000,000 times smaller than a human. However, this team consisting of mosquito and protozoan organism kills about one million people each year, delivering and causing malaria.

The males are harmless, as they prefer, instead of blood, plant nectar. Females also eat nectar, but some of the species consume mammalian blood to ensure their protein intake.

Although most species of mosquitoes can become carriers of diseases, we take contact with only few of them. Anepheles gambiae mosquito is fatal because they reproduce in any stagnant water source, has a long life and prefers to feed on human blood.

The plasmodium parasite that causes malaria enters the bloodstream with the insect saliva and in just 60 seconds reaches the liver, where it starts multiplying.

Angry Polar Bear


6. Polar bears - Ursus maritimus

A male polar bear can have a length of 2.1 meters when standing on their lower feet, weighing twice as much as a gorilla male, approximately 550 pounds. In addition, the animal is moving much faster than humans, both on land (where it reaches a speed of 40 km / h) and in water. Moreover, it seems that in the water, polar bears travel as much as 320 miles from the shore.

In the wild, polar bears sit near the holes from the ice of the sea and when they smell a seal, they catch it with a paw while crushing it's head in one bite.

Until now, records indicate that polar bears tend to attack humans only in fall, when large areas of ice melt and the chances of catching seals are minimal.

Black Mamba


5. Black Mamba - Dendroaspis polylepis

Dendroaspis polylepis is the longest venomous snake in Africa, its length being about 3 metres. The name is given by the black mamba's black mouth that can scare larger predators.

He usually avoids people and is responsible for far fewer deaths than the viper, cobra and the krait (Bungarus caeruleus). However, mamba's venom is very aggressive and has the fastest action in the world, considering all the snakes.

Without anti-venom, mamba's bite is fatal to humans. In general, due to the fact that the poison is spread quickly in the human body, the victim dies in less than 20 minutes. The venom causes dizziness, paralysis, heart failure and acute abdominal pain. Sometimes, even if the victim is treated with anti-venom, paralysis may be permanent. Estimates indicate that every year, a black mamba kills 1,000 people.

Black Mamba is also known for the fact that when can rise up to the head of a man while attacking, biting him several times.

Atrax robustus Spider


4. Spider - Atrax robustus

In most of the cases the females of this species stay sheltered and track the status of their funnel-shaped webs. Males, on the other hand, are walking, seeking for females to mate. As a result, there are more chances that a person can attacked by a male of this species and not by a female. The problem here is that the venom of the male is 6 times stronger than that of the female.

In general, these spiders feed on insects, frogs or lizards, but being aggressive, they don't step aside. If they think they are threatened by larger creatures, they do not hesitate to inject large quantities of venom. Most mammals are immune to the venom of this species, but not humans. We are very sensible to it.

Annually, Atrax robustus causes only a very small number of deaths among people, but this is because they exist only on small areas and of course thanks to an anti-venom.

Komodo Dragon


3. Komodo Dragon - Varanus komodoensis

There are very few confirmed attacks of Komodo dragons on humans and also fatal cases have been a few, but only because these animals are very rare. In the wild they live less than 5,000 Komodo dragons, spread on five Indonesian islands. Komodo Dragons are very determined as predators and usually they attack by ambush, but can also, climb trees or run with a speed of 19 km / h if it's necessary to capture their prey.

When the dragon captures it's prey, he keeps the pray on the ground and starts tearing it with it's razor-sharp teeth.

Also, the animal teeth are coated with a layer of living tissue that breaks when it eats. The combination of saliva, blood and dirt makes the bitten pray to have little chance of survival, even if he can escape the grasp dragon.

However, not only the large number of lethal bacteria from the teeth of this animal infects the victim, but also a pool of toxic substances from the salivary glands of the Komodo dragon that inhibit blood clotting and induce muscle paralysis.



2. Hippopotamus - Hippopotamus amphibius

For a long time, the hippo has earned a reputation as the most dangerous animal of Africa. Although he consumes only grass, he is a very aggressive animal. His canines, which are used only for defense, are extremely sharp and have a length of half a meter and incisors measure about 40 cm. In addition, the hippo can open its mouth larger than any other land animal.

Males are extremely aggressive especially when someone gets in it's aquatic territory. In order to protect the "harem" and the young, hippos often overturns boats and without a reason killing the people in them.

On land they are not so aggressive, but there were quite a few instances when cars were attacked during the safari tour.

From year to year the number of fatal attacks decreased, reaching somewhere around 150 cases, but only because the hippo population is declining.

The Great White Shark


The Great White Shark - Carcharodon carcharias

According to the official database, there have only been seven Great White attacks on humans so far.

By comparison, the great white has a record of 139 attacks since 1990 until today, 29 of them fatal. However, the reason the Great White shark is on this list is represented by the number of unregistered attacks.

This species prefers deep waters and rarely come into contact with people who swim or surf. But the Great White shark appears to be responsible for killing a huge number of castaways.

During the Second World War, the warships USS Indianapolis and Nova Scotia were torpedoed by submarines in tropical waters. It is estimated that hundreds of people which survived have fallen prey to this sharks.


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    • lrdl3535 profile image

      Richard Lindsay 

      5 years ago from California

      Great post, some of these I new about already. But I haven't thought about them for years. Nice to read about them again.

    • profile image


      7 years ago

      Dude the mozzi is rated officaly the most dangerous animal

    • klaus-gaming profile imageAUTHOR


      8 years ago from Iasi, Romania

      you are welcome :) glad you like it

    • phildazz profile image

      Allan Philip 

      8 years ago from Toronto

      Love your selection especially the dangerous domestic dog; very useful and informative, my thanks to you!

    • klaus-gaming profile imageAUTHOR


      8 years ago from Iasi, Romania

      Thank you kind lady

    • SavannahEve profile image

      Suzi Rayve 

      8 years ago from California

      Blech! I mean, I love the Hub and it is interesting! Just don't like the danger. :) Voted up!

    • klaus-gaming profile imageAUTHOR


      8 years ago from Iasi, Romania

      Thank you.I chose only 10...but I know there are a lot more

    • Melissa A Smith profile image

      Melissa A Smith 

      8 years ago from New York

      I certainly agree with the inclusion of the domesticated dog, simply because they mostly do not possess the instincts of wild animals therefore some methods that may thwart wild animal attacks will not work on them. Cape buffaloes should also be on this list alongside hippos, both are claimed to be the most dangerous in Africa. Voted up.


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