- Black Mamba
Though species like the boomslang or the king cobra are dangerous thanks to their respective poisons, the black mamba is especially deadly due to its speed. Found in the savannas and rocky areas of southern and eastern Africa, the species (which can grow up to 14 feet long) is the fastest of all snakes, slithering at speeds of up to 12.5 miles per hour, which makes escaping one in remote areas that much more difficult. Thankfully, black mambas usually only strike when threatened—but when they do, they’ll bite repeatedly, delivering enough venom (a blend of neuro- and cardiotoxins) in a single bite to kill ten people. And if one doesn’t receive the correlative antivenin within 20 minutes, the bites are almost 100 percent fatal.
Saltwater Crocodile
Florida's alligators may be scary, but they have nothing on their cousin, the fearsome crocodile, which is more short-tempered, easily provoked, and aggressive towards anything that crosses its path. Of all the species in the world, the largest—and most dangerous—is the saltwater crocodile, which inhabits the Indo-Pacific region ranging from parts of India and Vietnam all the way to northern Australia. These ferocious killers can grow up to 23 feet in length and weigh more than a ton, and are known to kill hundreds each year, with crocodiles as a whole responsible for more human fatalities annually than sharks. Saltwater crocodiles are especially dangerous as they’re excellent swimmers happy in either salt or freshwater (yes, their name is confusing), and can strike quickly with a bite delivering 3,700 pounds per square inch (psi) of pressure, rivaling that of the T. Rex. If that’s not enough to scare you, put it in perspective: humans chomp into a well-done steak at around 200 psi, a mere five percent of the strength of a saltie's jaw.Blue Ringed Octopus
About the size of a golf ball, don’t let its small stature fool you, this dangerous animal holds enough venom to kill 26 full grown adults and as you may have guessed, there is no antidote. Assuming that your friend ever gets bitten you had better know CPR because you can be sure that within minutes they will be completely paralyzed and unable to breathe. Mother nature, however, shows no mercy and they will maintain their consciousness for the next few hours until the venom is neutralized by their body. This is of course assuming that you, or someone at the hospital, continues artificial respiration.African Elephant
The world’s largest land animal, elephants can be fiercely aggressive and have been known to trample even a rhinoceros or two to death. They seemingly have the capacity to display bouts of rage and have even engaged in activities that have been interpreted as vindictive, razing entire villages in the process.Mosquito
Moving from one of the largest animals in the world we now come to one of the smallest. As small as it is though, it is also the deadliest. It has been estimated that mosquitoes transmit diseases to almost 700 million people annually resulting in 2 to 3 million deaths every year.
