#1 Blue-Ringed Octopus
The blue-ringed octopus can be found in crevices in tide pools and coral reefs. Despite their small size (5 to 8 inches), their venom is powerful enough to take down a human. Once bitten, numbness and paralysis may begin to take place. Death usually results from respiratory failure.
#2 Brazilian Wandering Spider
Known as one of the world's deadliest spiders, a bite can cause irregular heartbeats, immediate pain and cold sweats. If untreated, results could be fatal. In men? It can cause erections lasting for hours and can lead to impotence.
#3 African Lion
As natural hunters at the top of the food chain, their giant fangs, razor sharp claws, and lightning speed put them on this list.
#4 Saltwater Crocodile
Watch out! If attacked by one, the saltwater crocodile can travel with astonishing speed and strength. It kills its prey by clamping down with its jaws and then violently shaking the victim from side to side. This attack can separate your arms, legs, and head from your torso before being consumed in pieces!
#5 Great White Shark
The aggressiveness of the great white shark have been greatly exaggerated, but that doesn't stop it from making our list of dangerous animals. These creatures can detect one drop of blood in 100 L of water and smell it from up to 3 miles away. Although humans are not on their favorite list of things to eat, they will come up to taste you before swimming away.
#6 Cape Buffalo
Despite their cow-like appearance, the cape buffalo can charge and gore you with its razor sharp horns at any moment. It is extremely difficult to kill instantly, and if wounded, will circle around and stalk its hunter to wait for the right moment to attack. At 5.5 feet high and weighing over 1700 pounds, you don't want to mess with this animal.
#7 Asian Cobra (Naja Naja)
If cornered, the Asian cobra will bite again, and again, injecting a large quantity of venom into its victim. Some species can even shoot their venom out. Once attacked, the toxins in the venom can cause paralyzation and lead to respiratory failure or cardiac arrest.
Elephants are the world's largest mammal, weighing in between 6,000 to 15,000 pounds. Although they can be gentle creatures, their size alone can be dangerous. They have the ability to crush rhinoceros and can attack without warning for no apparent reason.
We hear all about tigers and lions attacking people, but the hippopotamus? You'd be surprised to learn that while this animal is mostly an herbivore, it is also aggressive, unpredictable, and not afraid to attack even without being provoked.
Mosquito bites may be common and harmless, but one wrong bite can introduce a deadly parasite into your circulatory system. This parasite causes between 350 and 500 million people to be infected with malaria every year and is often fatal (predominantly in sub-Saharan Africa).
#11 Australian Box Jellyfish
Found in the northern half of Australia, the box jellyfish contains one of the world's deadliest poisons. What's worse is that their transparency and pale blue color make them virtually invisible in water and unavoidable. Contact with the tentacles can cause cardiac arrest in just a few minutes.
#12 Golden Dart Frog
The poison dart frog may be small, but it packs a deadly poison called batrachotoxins. Coming into contact with one of these guys can kill you almost instantaneously. Each one carries enough poison to kill between 10-20 humans.