Super fact 98 : The deadliest animals in the world are mosquitos, snakes and dogs. Mosquitos kill an estimated 760,000 people each year. Snakes kill an estimated 100,000 people each year. Dogs kill an estimated 40,000 people each year. By comparison humans kill on average 600,000 other humans annually due to wars and violence.
The first time I heard that the deadliest animal in the world was the mosquito I was surprised. After I heard that the reason was all the diseases that mosquitos spread, such as malaria, dengue fever, and yellow fever, it made more sense to me. I recently learned that snakes kill 100,000 people every year. It surprised me because it seemed like a lot to me.
I was also surprised to learn that our best friends the dogs, come in as number three on the list of deadliest animals, at an annual kill rate of 40,000 people. Even though scorpions are not at the top of the list they kill 3,000 people annually, while spiders only kill 50 people. We have both venomous spiders and scorpions where I live, but I’ve been worried about spiders, not scorpions. It is also surprising to me that sharks only kill about 6 people per year. I guess my super fact 98 is a collection of facts regarding “killer animals” rather than one specific fact. I am hoping that at least one of the facts will be surprising to you.
I should mention that the numbers vary over time and different sources give different statistics. Therefore, the numbers should be seen as ballpark numbers and not exactly. However, Our World in Data is considered one reputable and highly reliable data source that is frequently cited in scientific journals, and access is free.
Mosquitos Kill 760,000 People Each Year
Mosquitos are the biggest killers of humans by far. 80% of those deaths are the result of malaria which is transmitted and spread by the Anopheles mosquito. We have made progress against malaria, and it used to be worse. In the 20th century 150 to 200 million people died from malaria, which is more than one and half million people per year. Smallpox killed 300 million people in the 20th century, but it was entirely eradicated by 1977 thanks to the smallpox vaccine. The two existing vaccines for malaria are relatively recent (2021 & 2023), not as effective as the smallpox vaccine was, and not yet as widely used, which is one reason malaria is still a major health concern.
In addition, mosquitos spread other diseases killing more than 100,000 people every year. Dengue fever, yellow fever and Japanese encephalitis, are a few of the more dangerous mosquito borne diseases.
Snakes Kill 100,000 People Each Year
The death toll from venomous snakes is uncertain but it is likely to be 100,000 deaths per year. The World Health Organization estimates that snake bites kill between 81,410 and 137,880 each year.
The most venomous snake in the world is the Inland Taipan. Its venom can kill over 100 people in a single bite. However, due to its shy nature and remote Australian habitat, no human deaths have been attributed to it. The most dangerous snake to humans, in terms of fatalities, is often considered the Russell’s viper, responsible for 25,000 deaths annually. Other snakes that kill several thousand people every year are the saw-scaled viper, the common krait, the Indian cobra in Asia, and the black mamba.
Dogs Kill 40,000 People Each Year
Even though there are some large and dangerous dogs, most deaths caused by dogs is from rabies resulting from being bitten by a rabies infected dog. See the horror movie Cujo.
Freshwater Snails, Kissing Bugs, Sandflies, Roundworms are Mass Killers
Other critters that kill thousand of people every year are freshwater snails, kissing bugs, sandflies, and roundworms. These critters kill people by infecting them with dangerous parasites or as in the case of roundworms, being a dangerous parasite.
Scorpions Kill 3,000 People Each Year but Spiders Only 50
I was at an overnight outing with the guys at work. I had just moved to Texas. We were standing or sitting around the fire drinking beer when I asked a question. I’ve heard about the scorpions in Texas, but I’ve never seen any. How common are scorpions?
A coworker named Gary told me to turn around, so I did. Behind me was a tree, and the tree was covered by crawling scorpions. Well, I was glad I did not lean on it. The scorpions I saw were the striped bark scorpion.
The reason scorpions kill a lot more people than spiders is that some scorpion species have a very potent and deadly venom. Some spiders are dangerous too, but spiders tend to have less potent venom.
The Big Cats kill only 300 People Annually and Sharks Only 6
Would you prefer to stay in a room with a Tiger or with a mosquito? Mosquitos kill 760,000 people every year, whilst Tigers only kill a handful of people every year. However, Tigers don’t kill less people than mosquitos because they are less dangerous than mosquitos. The difference is exposure. Mosquitos are everywhere but not Tigers. If Tigers were as common as people and everywhere people were, the numbers probably would be different.
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