10 of the Most Horrifying Insects

5. Killer bees

Killer bees

Africanized honey bee

The Africanised honey bee are commonly referred to as “killer bees” which should give a hint as to why they make it onto our list. These bees are regarded as super-aggressive and have been implicated in a number of deadly attacks.

The Africanised honey bee was the inspiration behind the 1978 horror movie “The Swarm” which saw mutant, killer bees going on the rampage in Texas. Although the reality is not quite as terrifying the origin of the bee is a little like something out of a bad horror flick.

Africanized honey bees were in fact created in a Brazilian laboratory in 1956. They were a hybrid made by crossing African and European honey bees to make a species capable of producing lots of honey but resistant to the tropical climate. Whilst the scientists might have succeeded in this respect they had also created a much more aggressive sub-species.
And as with all good horror plots some of the bees escaped from the laboratory and began heading north. The bees eventually became established in the southern states of the USA in the 1990s.

In terms of physical make up the Africanised bee is no more dangerous than your average honey bee. They are the same size and their sting is no more potent. What makes them so dangerous is their defensive behaviour.

For reasons of natural selection the Africanized bee exhibits far greater defensiveness when it feels its hive is under attack. Not only are the bees more likely to think they are under attack they will also recruit greater numbers. European honey bees under attack may recruit around 10% of the hive’s population to attack; with Africanised bees it is likely that the whole colony will attack. This means rather than tens of stings the victim is likely to receive hundreds.

Not only this but the bees are more aggressive. They will chase down the perceived threat over a much greater distance. Even jumping in a lake won’t shake them – apparently they will wait until you surface for air.

Despite the potential, “killer bee” related deaths are still fairly rare with only a few deaths occurring in the U.S. each year.

4. Asian giant hornet

Asian giant hornet (Vespa mandarinia)

Asian giant hornet (Vespa mandarinia) Photo: Yasunori Koide / License

Put the words giant and hornet together and you are going to get something pretty bad. There is no doubt this is a hornet and it is definitely big, measuring up to 2 inches (5cm) in length.

These super-sized wasps have earned themselves the nickname ‘yak killer’ in some parts, and this isn’t that far from the truth. Armed with a 1/4 inch (6mm) long stinger and particularly potent venom the Asian or Japanese giant hornet is a pretty terrifying insect.

The sting of the giant hornet contains a cocktail of cytotoxins and neurotoxins. It is the first of these that will cause all the pain and tissue damage with the sensation being described by one researcher as “like having a hot nail driven into my leg”.
The neurotoxins contained in the venom are what makes this insect as dangerous as it looks. Named mandaratoxin this can be deadly in sufficient doses even to those not allergic to wasp stings. In Japan over 30 people a year are killed by stings from giant hornets making it by far the deadliest animal in the country.

In China even more deaths are caused with over 40 a year in Shaanxi province alone. The medical advice here is if you get stung 10 or more times you should seek medical help. Get stung more than 30 times and you are in big trouble.

3. Screwfly

New World Screw-Worm Fly larva

New World Screw-Worm Fly larva (Cochliomyia hominivorax) / ©CSIRO / License

The New World screwworm is one of a class of insects which are the very stuff of nightmares. I don’t care how many people this insect kills, to me it is by far the most terrifying on the list. The scientific name (hominivorax) for this little monster gives some insight into how horrifying it actually is. This more or less translates as “man-eater” and they quite literally do.

The screwworm’s life cycle begins with the adult female fly laying in the region of a hundred eggs on their victim – some sort of warm-blooded animal. This is usually on or near the site of a wound although they are known to enter baby animals via their newly formed belly buttons. Over the next 24 hours the eggs hatch and the larvae start their quest for flesh.

Heading for the wound, these revolting looking little grubs use their flesh-cutting jaws and those scary looking fangs to burrow their way through their host’s skin. These maggots will continue drilling and eating their way all the way to the bone in some cases and it is only a matter of luck what damage they do on the way. The endlessly gruesome possibilities include biting into nerves or entering the bloodstream. It is said the more you try to get the screwworm larva out, the deeper it will burrow.

Screw-worm infection is every bit as bad as it sounds and you just have to look at the effect infestations have on livestock. If left untreated the maggots will continue to live off their prey until it dies. The damage they do up to that point is in many cases straight out of a horror movie.

One small positive is that humans are not first choice on the New World screwworm’s menu, but before you breathe a sigh of relief there are plenty of documented cases, few of which are as horrifying as British tourist Rochelle Harris’. After returning home from a trip to Peru she began to hear scratching noises, and they appeared to be coming from inside her head. As further symptoms such as headaches, shooting pains in her face and discharge from her here she sought medical help.

The doctors initially suspected an ear infection but when Ms Harris visited an ear specialist the beyond disgusting truth was revealed. Apparently whilst inspecting here ear the doctor went deathly silent and ordered an emergency scan. The scan confirmed what the consultant had seen – a writhing mass of maggots had burrowed over a centimetre into Ms Harris’ head.
They had managed to get in through her ear and then drilled through the ear canal. Fortunately for Ms Harris the larvae were all removed before they could cause any real damage. In the region of 8% of those infected are less lucky and die either as a direct result or some form of resulting secondary infection.

2. Assassin bug

Kissing bug - chagas

Kissing bug (Rhodnius prolixus)

Often referred to as the kissing bug we think its other name the “assassin bug” suits it somewhat better. Measuring around an inch (2.5cm) in length, these large bugs are the vampires of the insect world.
When in search of a meal the assassin bug is virtually flat. However, given the opportunity to feed the bug will swell up, loaded with enough blood to last it a month.

While the name “kissing bug” might sound remotely charming the reason behind it is anything but. The name originates from the bugs preferred feeding sites which are on the face, usually around the mouth, or quite often the eyes.

So far, so bad. But why did this little bloodsucker make it to the top of our “Most deadly creatures in South America” list? The simple answer is the assassin bug is the primary carrier of the potentially deadly Chagas disease. Widespread throughout South America this disease kills more people across the continent than any other parasite-borne infection, and that includes malaria.

In case you weren’t already reasonably horrified by this unsavoury bug there is more. It isn’t actually the bite of the kissing bug that transmits the infection. No, it is the fact that this insect likes to have a good poop on your face whilst it is enjoying feasting on your blood! Later on when you give that now itchy bite a good scratch you are effectively rubbing the disease-ridden feces into the wound. Nice!

Chagas disease is closely related to the African sleeping sickness which is carried by the tsetse fly. For the majority of those infected there are no symptoms, or they are very mild. However, for those that do react badly, around 30% will have medical issues later in life with many of these going on to develop potentially fatal heart and neurological conditions.

All in all it is estimated that there are 7 million people infected with Chagas disease. Of these around 7,000 a year dies as a result. There is no cure for the disease once it is established, although early treatment can stop this happening.

1. Mosquito

World's Deadliest Animals

Number of people killed by animals each year | Source: gates notes

Yawn! Yes, I know you’ve read it a million times, “and now for the deadliest animal in the world, the mosquito….”  Almost as boring as when people write, “shock horror, it’s humans”. Apparently though, on a good year, it is actually mosquitoes that cause far more deaths than humans.
That aside though, mosquitos are responsible for an incredible number of deaths every year, anywhere up to a million depending on your source. Pretty scary for an insect whose name innocuously  translates from the Spanish as “little fly”.

There are actually over 3,000 species of mosquito but we can actually narrow down the prime culprit to one particular group, Anopheles. And it is in fact only females that are blood suckers. Males on the other hand are content to live on a diet of nectar from flowers.

For those of you who do not find mosquitoes in the least bit frightening then maybe imagining them as used hypodermic syringes with wings. This is how they transmit various blood-borne diseases such as malaria and dengue fever.

Malaria is the chief killer of all the diseases carried by mosquitoes and they are more or less the only real means of transmission. It is neither a bacteria nor virus but in fact a microscopic protozoan parasite which spends much of its life cycle living within the red blood cells and the liver. It is a complex illness and in its most straightforward form presents with similar symptoms to flu. However, there is great scope for complications many of which are serious or even deadly. It is estimated that worldwide there are over 200 million people infected with the diseases and every year in excess of half a million die as a direct result.

But it isn’t just malaria that mosquitoes spread. Remember the screwworm at number 3? Well mosquitoes sometimes carry the eggs of a similar species, the botfly and these are deposited on the host when the mosquito feeds. Another debilitating disease carried by some species of mosquito is filariasis. These tiny roundworms infect the host’s lymphatic system causing the massive swelling of limbs that are symptomatic of elephantiasis.

Mosquitoes also carry a range of unpleasant viruses such as dengue, West Nile virus, chikungunya, yellow fever and Zika. Perhaps the only positive glimmer is that they are incapable of transmitting HIV because the virus is digested and broken down in the mosquito’s stomach.