Top 10 Worst Animals in the World

The Top Ten

Mosquito

The word "mosquito" comes from Spanish and means "little fly." Mosquitoes are small flying insects known for transmitting numerous infectious diseases. These include malaria, yellow fever, chikungunya, West Nile virus, dengue fever, filariasis, and Zika virus, making them one of the deadliest animal... read more

Mosquitoes are not only a nuisance to us, they also spread diseases and kill us. They make high-pitched whining noises that give you the same chills that nails on a chalkboard would when they fly around your ear, and they fly away when you try to kill them. They think that after everything they've done to the human species, they still have the right to live in our houses, forcing us to go to bed in fear of getting bitten.

You think humans are the worst? Well, I think you've forgotten about mosquitoes. At least some humans are nice and friendly and want to help the environment, but nearly all mosquitoes (specifically female mosquitoes) are true killers that have killed more humans than humans have killed humans. Also, they're everywhere on Earth and are annoying as heck.
Human

Humans (Homo sapiens) are the most abundant and widespread species of primate, characterized by habitual bipedalism and comparatively large, complex brains. These traits have enabled the development of advanced tools, culture, and language. Humans are highly social and live in complex structures, ranging... read more

I feel like the reason this list exists is purely to highlight the killers of humans and humans themselves. The human way of life is what's wrong. We fight with ourselves, not for survival, but because of conflicts. We kill each other for reasons more ridiculous than those of other animals.
Some of us treat other animals as lower beings and refuse to consider ourselves the same. What does life revolve around? Us! The reason many other animals still thrive is because of us. That may sound like it makes humans good, but frankly, that's not true. It makes the people who do it good, but makes the species as a whole worse. They survive because we pity or care for them. It makes no difference but morally, they should be allowed to survive because they're adapted to do so, not because we didn't destroy their homes.
The worst thing is that you can't even blame humans, but rather the race itself. We are adapted to live in environments that are adapted for us and a select few other animals. You could hate yourself every day, but there's nothing you can do about it. You are a human, the animal that pollutes the earth more than necessary, kills other animals, and treats others of its kind badly too. There's nothing that could change that. Even if every human was a good person, humans would still be the worst animal.
Fly

Ahh, flies, the creature that serves one purpose in life... to make life worse for those around them! Like, really, what is the point of them? They're gross, they contaminate, and they don't even serve as food for most creatures. Sure, frogs need them, but they can just eat other insects.
Flies do nothing but fly and make an annoying sound. Why can't they just leave us alone! All their babies are disgusting.

Flies are annoying and gross. They get into your food and make it all yucky. They fly around animal droppings and make annoying noises. Watching them fly around is bad enough. I'd be surprised if anybody likes flies.
Leech

Leeches are segmented worms that belong to the phylum Annelida and comprise the subclass Hirudinea. Like oligochaetes, such as earthworms, leeches possess a clitellum and are hermaphroditic. They are found in freshwater, marine, and terrestrial environments and are known for their use in medical bloodletting... read more

I got a leech on me once. Leeches are so disgusting and ugly.
Although they can be used to get rid of diseases, that's the ONLY thing I like about them!

These are so creepy.
I guess there's a reason they exist, but I still hate them. They should definitely be higher than hyenas (hyenas are actually rather cute, honestly).

Not all leeches are harmful. Maybe some leeches are bad, but in some cases, they use them for their medicinal properties, as they suck the bad blood that causes diseases.
Tick

The absolute worst. Be careful when walking in the forest. Always wear clothes that cover your arms and legs. Ticks can give you diseases that could kill you.

Foul creatures. They spread disease, and few animals eat them. They are parasites that are stressful to remove from an irritated dog. Truly disgusting to look at.

Ticks are the worst. (Hyperbole, of course, mosquitoes are worse). But it is terrifying to see you have one attached to you. And they can dig in and get stuck there!? No, goodbye. I am leaving Earth. Does anybody have a spaceship?
Wasp

Let's look at wasps versus bees.
Bees pollinate and help the environment. They help food grow and make honey. And we wouldn't have the bee movie memes without them.
Wasps are just pests. They don't help the environment or anything. They don't make memes and they serve no purpose on the planet. They're just useless compared to bees.

I remember getting stung by a wasp when I was about 4 (which was in 2012). I was at a car boot sale and my dad got some sweets. I ate them, and suddenly, a wasp came and stung me! I was crying. That's why I hate wasps so much.
Hyena

Hyenas, or hyaenas, are carnivorous mammals belonging to the family Hyaenidae. With only four extant species, they represent the fifth-smallest biological family in the order Carnivora. Despite their small number, hyenas play a vital role as both predators and scavengers in their ecosystems.

Hyenas are lazy cowards. They steal from other predators because they're too lazy to hunt themselves, always aiming for the babies because they're too scared to go for the mother or herd. They eat prey alive, causing extreme pain. Their laugh sounds like the devil choking. They're the ugliest animal on earth.
Sisters kill their sisters and bully their brothers as babies. If it weren't for their bite force, they'd be the worst predator on earth because they're so small and useless.

These animals are nasty, filthy vermin. I absolutely despise them. They eat animals alive, steal from other predators, always attack baby animals, and have a disgusting laugh that sounds like the devil choking.
Termite

Termites are eusocial insects classified within the infraorder Isoptera or, in more recent taxonomy, as the epifamily Termitoidae within the cockroach order Blattodea. These insects are known for their wood-eating behavior and the complex colonies they form. Termites play important ecological roles,... read more

Termites suck. Pigs are on this list, and they don't suck. They're amazing, as are rabbits. I hate whoever put rabbits on the list.

A swarm of angry termites can destroy a tree within 20 seconds. I wonder how long it takes for them to destroy a wooden house...

Termites can cause problems by eating your house.
Cockroach

Cockroaches (or roaches) are a paraphyletic group of insects in the order Blattodea, which also includes termites. About 30 out of approximately 4,600 cockroach species are associated with human environments. Several of these species are considered pests due to their presence in homes and buildings.... read more

Monkeys, anacondas, jackals, hyenas, pigs, and more are ranked higher than cockroaches on this list! What!? I have no hope for humanity anymore. Weird world we live in...

Even though cockroaches are harmless, they are so nasty. They are always crawling around your home or garage and will never truly leave.

Italian cockroaches are disgusting. They get into your house and spoil your food.
Lice

I've gotten them twice before. Once, it affected my family. The second time, I got them out secretly somehow. They just disappeared after combing for a couple of weeks.

They just decide to go have babies on your head and don't leave unless you get them out.

UGH. I had such a traumatizing experience with them. Hate lice.

The Newcomers

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Mandrill

Screw you, whoever added this! Mandrills are beautiful and what did they ever do you?
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Potoo

Oh my god! They are scary. The noises they make are terrifying and how wide they can open their mouths! They low-key remind me of the owl from 99 Nights in the Forest.

These birds are basically the stuff of nightmares. They look like someone mixed a sparrow with an owl and then didn't feed this amalgamation for weeks.

The Contenders

Flea

Fleas, classified under the order Siphonaptera, comprise about 2,500 species of small, wingless insects that are external parasites primarily of mammals and birds. These insects survive by feeding on the blood of their hosts using specialized mouthparts adapted for piercing skin and sucking blood. Adult... read more

Honestly, I hate them more than almost everything on the list. They get on your animals, and if they get on you, it is even worse. Can you avoid mosquitoes by not going outside? Almost, they can't get you inside, but you are going to have to go out of the house sometimes.
Can you avoid fleas? Probably not, they are inside your house and if you don't spend a ton of money trying to kill them, then you will be stuck with them for a while.

Fleas are so gross and disgusting! They bite innocent little animals and make them itch. They also started the plague.
Jackal

The jackal is a small omnivorous mammal belonging to the genus Canis, which includes the wolf and the domestic dog. Although the term "jackal" has historically been used for various small canid species, it now commonly refers to three: the black-backed jackal and side-striped jackal of sub-Saharan Africa... read more

If they are like foxes, they do suck. Jackals aren't even well-known. I couldn't find any other animal here to put on the list, so here you go.

I know, right? Jackals are terrible. They're stupid, and whoever likes them is an idiot. They always go for the baby animal instead of the adult because they're too weak and they're too much of cowards.

Jackals are one of my least favorite animals of all time. I absolutely despise them and would hunt them without hesitation. They're nasty, useless animals.
Rat

Rats are various medium sized, long tailed rodents of the superfamily Muroidea. "True rats" are members of the genus Rattus, with the black rat (Rattus rattus) and the brown rat (Rattus norvegicus) being the most significant to humans. These species are commonly found in urban areas and are known for... read more

How are monkeys worse than rats? These rodents do nothing but spread disease. They were responsible for the Black Plague and they disgust me. Their smaller counterparts, mice, are better. Worst animal ever.

Those guys are disgusting. While the nice animals become extinct, they grow much more. They exist in sewers and go anywhere. They are such disgusting creatures.

The only reason they spread disease is because of their fur. They had no actual intention. On the other hand, humans use lab rats and ruin their lives.
Maggot

I don't like maggots because they are so slimy and wormy, and I don't like worms at all. They are helpful but disgusting.

Maggots are so gross.
They grow up into flies, which aren't that bad, but maggots are just disgusting!

I don't want to see this. Like seriously, they may seem harmless, but they do something to your body. (At least I think so.) Worms are my least favorite living thing. I hate them, and maggots are basically worms!
Normal worms do give life to plants, so I say they should exist (if they actually give life to plants, otherwise, I wish they didn't exist), but not maggots!
Bedbug

Bugs stopping my sleep. But they are an animal that wants to sleep with me in one bed, so one point for redemption.

I'll never forget the horrible smell of getting my house fumigated three times over a minor infestation.

Bedbugs should be a lot higher than 14.
They literally bite you in your sleep.
Monkey

Monkeys are haplorhine primates that form a paraphyletic group. Most monkeys have tails and are distinct from apes. There are approximately 260 known living species of monkeys.
They are divided into two groups: New World monkeys (Platyrrhines), found in Central and South America, and Old World... read more

I believe in respect and love for all animals, other than obvious vermin like bed bugs, and the Macaque monkey. They look like a cross between a human and a rat!

Let's sing the I Hate Monkeys song!
Curious George, Curious George, I want to throw you in a gorge.
Diddy Kong, Diddy Kong, iconic, but been around for far too long.
Boots, Boots, I want to steal your loot. But I can't promise I won't shoot.
I hate monkeys, I hate them. Stupid little troublemakers who sit in a tree.

They even have harems. They don't realize anarchy is antisocial.
Centipede

Centipedes are arthropods belonging to the class Chilopoda of the subphylum Myriapoda. They are mainly carnivorous and prey upon insects, spiders, small birds, rodents, and even other centipedes. Centipedes are found in a wide range of environments, from tropical rainforests to deserts.

Seriously, people hate cats more than centipedes? Okay, let's throw a bunch of centipedes on the people who voted that cats were the worst.

They're terrifying creatures. Similar to tapeworms, if you accidentally eat one, then it's stuck in your body. I just can't imagine having a 20-footed creature crawling around in my body.

Ugh, I cringe whenever I see one. I love all kinds of animals, but ones like centipedes and millipedes disgust me.
Tapeworm

Another kind of worm. Seriously, they are so disgusting! I do say they should exist because they give life to plants, but I never want to see one.
I wish plants didn't need worms. I also don't exactly know if they actually need worms. If they don't, I wish they didn't exist. Sorry worms, but I just hate you. So sorry.

Tapeworms are vile, disgusting, and deserve to burn in hell. They are probably the most filthy degenerates out of all the animals and are literally parasites that grow inside people. And people think naked mole rats are worse, wow.
Anaconda

Anacondas are a group of large snakes of the genus Eunectes. They are found in tropical South America and are known for their size and aquatic habitat. The green anaconda (Eunectes murinus) is the heaviest and one of the longest snakes in the world.... read more

Anacondas are extremely vicious and aggressive. They strangle you to death, which has to be the most painful form of death in existence.
However, they are only found in rainforests, so the majority of the human population is safe.

I don't like snakes because they can crawl wherever they want, but I especially hate the venomous ones.

If this animal didn't exist, the song Anaconda wouldn't be a song. Dang, I wish this weren't an animal.
Hornet

Hornets are the largest of the eusocial wasps and are similar in appearance to their close relatives, yellowjackets. Some species can reach up to 5.5 cm in length. They typically build large nests and are known for their potent stings and aggressive defense behavior.

They're scary and they need to die. They are useless and have no purpose in this world. They are evil and I hate them so much.

Hornets should be exterminated. Everything has its place in nature, but these things are just the worst.

I don't like them. How could anyone put pandas, polar bears, cats, and dogs on this list?! They're awesome!
Fruit Fly

I had hundreds of them. Literally, we had to make five traps, and it took about a week to kill them all.

Why? So much scientific research is done on them.
Mouse

A mouse is a small rodent characterized by a pointed snout, small rounded ears, a body-length scaly tail, and a high breeding rate. The best-known species is the common house mouse, which is found in homes and urban areas worldwide. Mice are also popular as pets and are widely used in scientific research... read more

I notice that people in media are ridiculed and seen as sensitive for being afraid of mice, but they can spread disease and they cause house damage, chew your stuff, and eat your food. Droppings everywhere. They pee on your stuff and that can make you sick.
When I hear a mouse chewing I panic. They're the cutest little dreadful things. I only like them in fiction or if a pet mouse doesn't escape.

Gets my vote. I hate it when people say they're underrated when they're really overrated. I hate it when mouse fanboys say they like cats or dogs just because they eat mice. I hate it when fanboys say "ewww" at cats and dogs. I hate it when people defend mice.
I hate it when a mouse bites me. I hate it when people call me evil just because I hate one animal. I hate it when mice make those little obnoxious squeaking noises. I hate their looks. I hate it when a mouse tries to climb up my feet. I hate it when "Squeakers" (mouse fanboys/girls) hit cats and dogs just for the sake of it. I hate it when Squeakers attack me for not liking this so-called "animal." I can't even consider these pests as animals, because they aren't. They're just waiting for cats to go extinct so they can rule the entire world.
Let me say this, Squeakers: a world that had world peace all because of mice saving the day is a world I would hate to live in. I would move to a different planet if mice took over the world. Luckily, that's never gonna happen because we humans have these awesome things called mouse traps (they're literally one of the best things you could buy, I'm not even joking when I say that). If you don't know what they are, they're basically things that kill mice. Yeah, I just like them because of that reason. I think mice deserve to be at the top of the list more than anything else!
Coyote

Coyotes are canines native to North and Central America. They are highly adaptable animals and can survive in a wide range of environments, including forests, grasslands, deserts, and even cities.
They are similar in appearance to domestic dogs but tend to be smaller, with pointed muzzles, erect... read more

I can't believe I had to add this myself. These stupid things kill cats and dogs, and when they kill farmers' sheep, they don't even eat them. Worst animal ever, along with hippos and eagles in my opinion.

They are related to wolves. What do you expect? Coyotes just do the same as wolves, like they are trying to be the same. Wolves suck too, but a bit more than coyotes.
Fox

Foxes are small to medium-sized animals in the Canidae family, which also includes jackals, wolves, and domestic dogs. There are 37 species of fox, but only 12 are considered true foxes of the genus Vulpes. Foxes are omnivorous and adaptable, with diets that include small mammals, birds, reptiles, insects... read more

I do not know why people seem to like foxes. I mean, they are just stupid animals that don't care about hurting wildlife. They suck. They are as stupid as cats are.

Not only are they an invasive species, but they also kill and eat your babies, and spread rabies, among other things.
Skunk

Skunks are mammals known for their ability to spray a liquid with a strong odor as a defense mechanism. Species of skunks vary in appearance, with coloration ranging from black-and-white to brown or cream. All skunks have warning coloration to deter predators.