Most spiders are not lethal, however there are many spiders that can kill you with a single bite. Some spiders are extremely aggressive and will not hesitate to attack and bite a human. Here are the 12 most dangerous spiders in the world, so you can know what to avoid.

12. Hobo Spiders

Hobo Spider(81218)

Hobo Spiders are one of the most dangerous spiders in North America. Unlike Recluse spiders, the Hobo Spider is a very aggressive spider and often chooses to build a web near humans.

European Hibo Spiders rarely come into contact with humans because of other spiders, however in North American the Hobo Spider is the "King of the Hill" and human contact is very common.

The Hobo Spider is considered to be aggressive because it will often build a web where humans live, and then will rapidly attack any insect that gets caught in the web.

A hobo spider bite can cause Necrosis, which is the killing off of live tissue and cells on a human. H0bo Spiders are very common in the United States.

11. Yellow Sac Spider

Yellow Sac Spiders have cytotoxin that can cause Necrosis. The toxic poison is similar to the Brown Recluse spider, but the wound will heal faster with the Yellow Sac Spider.

10. Fringed Ornamental Tarantula

Fringed Ornamental Tarantula

The large fangs of the Fringed Ornamental Tarantula have caused humans to go into comas! Although these are potentially very dangerous spiders, they are often sold as pets to people online. These are brave people (Or Stupid), because I would not want to have a Fringed Ornamental Tarantula pet in my house.

9. Chinese Bird Spider

bird spider tarantula KillerCredit: Flickr/snakecollector

The Chinese Bird Spider is a type of tarantula that is found in China and Vietnam. The Chinese Bird Spider can often be found with a leg span of up to 8". This spider has a poisonous neurotoxin that is considered to be extremely dangerous.

8. Mouse Spider

Poisonous Mouse Spider PictureCredit: Flickr/Christof In Oz

The Mouse Spider is an extremely aggressive spider that can be found almost everywhere in the World. A bite from the Mouse Spider can cause muscle spasms and intense pain. You can even be knocked unconscious by a bite from the little Mouse Spider.

7. Brown Recluse

Brown Recluse Spider(81240)Credit: Wikimedia/mattb

A Brown Recluse spider bite can cause intense vomiting, open sores, dead tissue, fevers, and even death in small children and the elderly. Amputation of limbs have occurred because of Brown Recluse Spider bites that got severely infected. A spider bite from the Brown Recluse is very painful.

6. Chilean Recluse

Chilean Recluse SpiderCredit: Wikicommons/Nicholas Ta (ta-graphy)

A Chilean Recluse is a direct relative of the Brown Recluse and is even more dangerous. A Chilean Recluse can cause large open sores, nausea, vomiting, migraines, and extreme pain in the bones. The Chilean Recluse Spider is usually found in South America, however they are also semi-common in some States such as California. The Chilean Recluse is slowly expanding to the other warmer Southern States in the USA.

5. Redback Spider

Redback SpiderCredit: Flickr/quinet

Redback Spiders are a relative of the Black Widow Spider. Redback spiders are considered one of the most dangerous and poisonous spiders in Australia, where they are commonly found.

Only the female bite is dangerous. A female bite from a Redback Arachnid can cause severe muscle aches, nausea, faint headed feeling, headaches, and vomiting. As with most poisonous spiders, there is an anti-venom available.

4. Black Widow Spider

Black Widow Spider(81248)Credit: Flickr/jurvetson

A Black Widow bite can cause extreme pain, nausea. The Back Widow Spider bite can also paralyze your diaphragm, making breathing extremely difficult. Although Black Widow Spiders are extremely dangerous, they usually do not cause death. Death can occur, however it is usually limited to young children and elderly people with weakened immune systems.

3. Sydney Funnel-Web

Sydney Funnel-WebCredit: Wikicommons

The Sydney Funnel-Web Spider is currently found only within 70 miles of Sydney, Australia, however illegal exports of the spider have been found as spider collectors aim to get one of the most poisonous and dangerous spiders in the World.

The Sydney Funnel-web poison contains atracotoxin. Atracotoxin is an extremely toxic substance to humans, and can easily result in death.

2. Six-Eyed Sand Spider

Six-Eyed Sand SpiderCredit: Wiki Commons/

The Six-Eyed Sand Spider is found in South Africa. Many researchers claim that the Six-Eyed Sand Spider is the most poisonous spider. Six-Eyed Sand Spiders are not aggressive, however they will bite humans if they are accidentally touched. Accidentally touching a Six-Eyed Sand Spider is pretty easy to do, because the Six-Eyed Sand Spider will camouflage its body by lying in sandy areas. If you are walking barefoot and get bit by a Six-Eyed Sand Spider you can expect live tissue and cells to die on your body, as well as some of your red blood cells bursting open and spreading haemoglobin into the surrounding fluid in your body.

Brazilian Wandering SpiderCredit: Wiki Commons/João P. Burini

1. Brazilian Wandering Spider

Although many experts consider the Six-Eyed Sand Spider to be the most venomous spider on Earth, the Brazilian Wandering Spider is considered to be the most dangerous. The Brazilian Wandering Spider is in a close second place for the most poisonous spider, however the Brazilian Wandering Spider is the considered the most dangerous spider in the world and should never be handled such as in the picture above. It is common to find this spider acting aggressively.

Unlike the Six-Eyed Sand Spider, the Brazilian Wandering Spider is very aggressive and very territorial The Brazilian Wandering Arachnid will attack to defend its territory regardless of the size of the enemy. If a Brazilian Wandering Spider feels you are encroaching on his or her territory, they will attack.

The Brazilian Wandering Spider does not spin a web and then wait for insects to land on it and get stuck. A Brazilian Wandering Spider will head out and go hunting for their prey, usually at night.

There currently is no anti-venom for this spider. If a human is bit by this vicious spider it can result in death or the loss of a limb due to rooting cells and tissues. The Brazilian Wandering Spider may not always inject a full load of venom into a human when it bites, but if it does you will be luck to stay alive!