You definitely want to avoid stepping on one of these if you’re in a bushy area in Australia, Papua New Guinea, or nearby islands. While other snakes will slither away at the presence of a threat, the Death Adder freezes.
Their long fangs can deeply penetrate your skin and inject an average of 40-100 mg of highly toxic venom with one bite. Their bite can lead to paralysis and, ultimately, to a complete respiratory shut-down within six hours.
African Tsetse Flies
Found in sub-Saharan Africa, these flies carry the sleeping sickness, which can affect humans and be deadly if not diagnosed and treated on time. According to researchers, they are responsible for a whopping 250,000 human deaths a year.
They spread diseases by feeding off the blood of their hosts. They are mostly found in tropical Africa.
Electric Eel
Known as a deadly predator in the waters of the Amazon rainforest, they get their name from their ability to generate a strong electrical charge of up to 600 volts. They're not actually eels, but a member of the “knife-fish” family.
These fish are highly desirable by some animal collectors, but very hard to catch. The only viable way is to exhaust them by making them deplete all of their electricity. Eventually, the fish’s electric organs become discharged and the hunter can swoop in for the kill.
Bull Shark
Found worldwide among warm, shallow waters along coasts and rivers, is one of the most dangerous and aggressive species of sharks, even more so than the great white.
Also known as the Zambezi shark, the bull shark is a determined predator and rarely fears being attacked by other animals. Humans pose the biggest threat to them, but that still doesn't mean you want a one-on-one meeting with any of them.
Mosquito
While we all hate being bitten by mosquitos, their bite can actually be deadly. These minuscule pests cause 2 to 3 million deaths every year and spread diseases to 700 million people.
They take host to a variety of mammals, birds, reptiles, amphibians, and even some fish. They are found in all different climates, including warm, humid tropical regions and cold regions. There is literally no getting away, though a mosquito repellent should do the trick. And as long as you are not allergic, you will probably survive a sting.