Some really poisonous Animals: The most poisonous animals are a controversial subject. There are many factors including strength per gram, quickness, effect, etc.

1. Box Jellyfish

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Where: Box Jellyfish are found in tropical waters around Oceania, Australia, and southeast Asian islands.
Venom: Their venom is extremely powerful, attacking the heart, nervous system, and skin cells. Also, it's extremely painful. Most human victims go in shock and drown/die of heart failure before the poison even takes full effect. Survivors usually have pain where hit for weeks after it happened. Permanant scarring also happens.
Fast facts: 1.Box Jellyfish are also called sea wasps and marine stingers.
2.Many tentacles grow from each corner of the jellyfish and can reach 10 feet (3 meters) in length. Each tentacle has about 5,000 stinging cells (the poison is triggered by a chemical on the skin/scales of humans/fish).
3. Box Jellyfish are extremely smart for jellyfish. Instead of just floating around, they can actually move around and have eyes!
4. It is the cause of 5567 deaths since 1954 (probably more since the website was made a while ago)

2. Cone Snail

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Where: Mainly around areas around the Indian/Pacific Oceans (Oceania)
Venom: Although the cone snail is only about 6 inches long, one drop of it's venom (delivered through a sharp tooth) is strong enough to kill 25 full grown humans! It is made up of hundreds of toxins and can cause instant paralysis, breathing failure, and intense pain. There is no cure; doctors just try to keep the victim alive until the poison wears off.
Cool Facts: The Cone snail has over 500 varieties
Only about 40 deaths have been reported, caused by the cone snail.
Parts of Cone snail venom is very effective as painkillers - ironically.

3. Stonefish

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Why is a stonefish called a stonefish...? Because it looks like a stone! Amazing! Anyways, the stonefish is the world's most venomous fish. It's poison causes severe pain and is accompanied by shock, paralysis, and destroyed tissue. Although it's not obvious, this venom is injected through spines to hurt predators. If not treated within a couple hours, it's poisonous. Stonefish live in shallow marine waters in the Pacific and Indian Ocean, including popular places like the Great Barrier Reef. So make sure you look before you step.

4.The Brazilian wandering spider

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The Brazilian Wandering Spider or banana spider is in the Guinness Book of World Records for the most venomous spider in the world. This is the spider responsible for most human deaths compared to any other spider.
This spider has the most powerful neurotoxic venom of any living spider. Only 6 micrograms of it is enough to kill a mouse. That means only a milligram can kill 167 mice! Apart from being venomous, they are also dangerous because they wander around instead of staying in one place (note the name). They often hide during daytime in highly populated areas inside houses, clothes, boots, and cars.
It's bite is very painful. I didn't check, but my guess is that this spider lives mainly in Brazil.

external image 08-most-poisonous-animals-in-the-world-inland-taipan.jpgThe World’s Most Venomous Snake is the Inland Taipan (also known as the fierce snake) of Australia. Just a single bite from this snake contains enough venom to kill 100 humans or an army of 250,000 mice. Dun Dun Dun Dun!!!! Anyways, its venom is at least 200 – 400 times more toxic than a common cobra. The Inland Taiwan’s toxic affects neurons and the venom can kill an adult human in as little as 45 minutes. Fortunately this snake is very shy and there have been no documented human fatalities (all known bites were treated with antivenin).

6. Poison Dart Frog

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The Poison dart frog was named because it was poisonous, the poison was used by indigenous people to coat darts, and it's a frog. There are over 200 varieties of these frogs in all colors (green, yellow, blue, red, etc.). It's bright colors tell predators that it's poisonous. Even if you just touch it, you'll get poisoned. Anyways, it has enough poison to kill 10 human adults or 20 thousand mice. This may not seem like a lot comared to other animals on my list, but if you consider the size (about 2 inches long), this animal is really poisonous. Compared to 6 micrograms killing 167 mice for the brazilian wandering spider, this frog can kill 20 thousand mice with just 2 micrograms of poison! That's 3 times less poison killing a heck of a lot more. By the way 2 micrograms fit on the head of a pin.