These Are The Most Disgusting Animals On The Planet

The natural world is a beautiful thing. Across the planet, contrasting landscapes from the deserts of the Sahara to the ice sheets of Antarctica offer habitats for a plethora of lifeforms. Majestic mammals like the lion and the wildebeest, glorious soaring birdlife such as the golden eagle and mighty condor, and mysterious, magical sea life — the blue whale, the basking shark — all call Earth home and manage to survive and thrive in some of the most unexpected places.

In this increasingly urbanized, interconnected world, we are repeatedly reminded that we have to make time to reacquaint ourselves with the natural world from which we sprung. But the truth is, not everything on Earth is as charming as the above paragraph might suggest. Of course, every living thing on this planet has its place, but after reading this list chances are that you'll be more than happy to give the natural world a miss for quite some time.

Lizards are incredibly diverse, with over 6,000 unique species found all over the planet, and with some basically unchanged since the Early Jurassic epoch. Some species — such as the sticky-fingered gecko or the color-altering chameleon — are undeniably cute despite their cold-bloodedness. But this reptile group also boasts some of the most repulsive creatures on the planet that you certainly wouldn't want to encounter out in the wild.

On the face of it, the horned lizard has a rather appealing look about it. A small, toad-like reptile found in North and Central America, its stout body is covered in impressive spikes that give it the look of a baby Godzilla. However, as the horned lizard is potential prey for many wild animals, the species has developed a truly gross defense mechanism.

As described by the BBC, the horned lizard has developed the ability to pool blood in sacs called the "ocular sinus," below its eyes, and is able to squirt its contents at will up to a distance of 6 feet. This jet of foul blood is typically aimed right in the mouth of potential predators such as coyotes, which are repulsed enough by the disgusting taste that the prickly reptile is able to escape from harm.

Culturally, frogs are pretty divisive. For some, they are enough to elicit the same phobic reaction that many of us feel on encountering snakes, rats, or spiders. For others, they're cool, or even cute — does anyone really have a problem with Kermit?

Some species, such as the poison arrow frog, are profoundly deadly, but it isn't the world's most poisonous frogs that have been raising eyebrows in the internet's wildlife communities in recent years. Rather, it is the Central African Trichobatrachus robustus – aka the "hairy frog" — that has been getting all the headlines, with New Scientist referring to the species as the "horror frog."

The creature has risen to prominence because of two rather unnerving physical attributes. The first is the presence of thick, mane-like hair that adorns the flanks and hind legs of the male of the species, giving the frog the appearance of a frog-wolf hybrid. According to Scientific American, it is believed that this feature increases the frog's ability to remain underwater for longer stretches when guarding the female's eggs. Second, the hairy frog has been shown to have claws — that's right, claws — made of bone that burst through the toes of its hind legs, and which are believed to be used in "interspecific combat," per the same source. No wonder this species has yet another nickname: the "wolverine frog."

To most laymen, the fulmar looks like any other seabird — indeed, it could easily be mistaken for a regular seagull. Found in the North Atlantic, North Pacific, and exclusive to Alaska in the U.S. according to All About Birds, the species isn't especially notable in the same way puffins or penguins are.

But as many climbers will confirm, there is one thing about this bird that is especially vile and therefore makes the fulmar worth avoiding at all costs: its ability to vomit. According to Blasting News, the fulmar — the name of which derives from the phrase "foul gull" — defends itself by firing jets of foul-smelling oil, which it produces especially to repel would-be predators. Fulmar chicks are especially happy to produce a squirt of the gross liquid when its nest is invaded. While the effect on most four-legged visitors is to make them think twice about re-entering, for other birds who get hit by the sticky liquid the consequences are far direr, as the oil has the effect of gluing their feathers together, instantly impairing their ability to fly and often sending them to their deaths in the sea below.

The name "sea cucumber" has always seemed a bit of a joke. Though this freaky organism is long, in no way else does it resemble that innocuous and inoffensive fruit, starting with the fact that it's actually an animal — and a pretty gross one at that.

According to Thought Co, a sea cucumber is basically a tube with a mouth and an anus at opposite ends, but, unlike, say, a worm, a sea cucumber actually has feet, which are tiny and located around the rim of its mouth. As well as being used to anchor the creature to the ocean bed, they are also tools for identifying minute pieces of food among the sand. Not too gross in itself, but that's just to whet your appetite for the next two tidbits that are to follow.

First, the sea cucumber breathes through its anus. That's right: they actually suck water in and out of there, which contains what is called a "respiratory tree" to keep themselves oxygenated. According to National Geographic, their need to keep their butt opening and closing in such a way also means they become host to other creatures, such as the pearlfish, which is happy to make its home in a sea cucumber's anus (and which therefore could be on this list all on its own). And second, the sea cucumber is capable of what academics (via Research Gate) call "evisceration," a mechanism by which it can expel at will its internal organs. Per Thought Co, this may occur when the creature is stressed or suffering from a chemical imbalance, but it may also occur to save the sea cucumber from predators, in the same way a salamander might shed its tail as a decoy before fleeing a predator.

Arachnophobia is very common, and in the case of venomous spiders such as the black widow, entirely justified. But what exactly motivates our fear of spiders in regions where the insects are uniformly harmless? The easy answer is the legs, which are truly horrifying. But then that begs another question: is it true that the more legs a creature has, the freakier it is? In the case of the giant desert centipede, the answer is: Yes. Yes, it is.

Native to North and Central America, these big and fearsome-looking crawlers are enough to give you nightmares on sight ... and that's before you know anything about them. But the colors give the game away: giant desert centipedes are venomous, with two the two legs either side of their mouths modified to act as pincers, through which they grip their prey — typically lizards, frogs, small mammals, and other insects — and inject a fatal liquid (per San Francisco Zoo). This centipede's "pinch" can also deliver a serious punch to humans, and is especially dangerous to young children. So it turns out we as a species are right to be freaked out by too many legs — some of them might be doubling as pincers.

When an insect has the word "human" in its name, you know it's not going to be good. The human botfly looks like any other regular fly, but there is one nightmarish fact about it that makes it top of the list of flies you would want to avoid.

A BMJ Case Report from 2019 tells the horrifying story of a middle-aged British woman who fell ill upon returning home from Argentina. She went to her doctor complaining of pains in her head, and the doctor observed "cysts" which had recently appeared on the woman's scalp. Can you tell where the story goes from here? The pain from the growing cysts increased to the point the woman went to the hospital, where it was discovered that she was the victim of a parasitic infection, with all three of the spots filled with a number of human botfly larvae. Apparently, botflies inject their eggs into mosquitos, which then transfer them into warm-blooded animals as they feed on their blood.

The report doesn't go into the horror that the woman must have felt on realizing her head was playing host to insect life but does recount that the patient's guests were extracted through minor surgery, and the creatures' former homes cleaned thoroughly with saline. That's one vacation she won't be forgetting in a hurry.

Ancient animals tend to be weird-looking, and so do creatures that live at the bottom of the sea. And the goblin shark — which ticks both of these boxes — is one of the weirdest looking of all. And not in a good way.

Per Fact Animal, the goblin shark has been around for 150 million years, hunting prey in the deep dark waters some 4,500 feet below sea level. Like most animals down there, where light is minimal, it has poorly developed eyesight and therefore has that beady, horror show look about it that really makes you want to give scuba diving a miss, however rare sightings of them in the wild might be.

But worse still is the goblin shark's mouth, a truly revolting physical feature that really is the stuff of nightmares. As Fact Animals describes, eyesight and swimming ability are not the goblin shark's strong points. What it does instead is float around waiting for prey, and then traps any passing target in its baggy, protruding, semi-detachable jaws, which are lined with row after row of claw-like teeth. Not a great way for any sea creature to go. Luckily, they're harmless to humans. But when has that helped anyone overcome their repulsion to something this freaky?

A sweet, sweet name for a horrible, horrible animal, and unlike many of the unfortunate creatures on this list, one that you really should avoid at all costs.

From a distance, a honey badger could look like a bit of a cutie. Looking a little like a regular badger crossed with a Muppet, the honey badger is actually a large weasel, according to National Geographic.  But whatever their lineage, nothing accounts for the species' seemingly inbuilt aggression. Footage has been captured of honey badgers chasing deadly snakes through trees — their thick hides protect them from many bites, while they are also able to recover from being injected with venom, per Africa Freak – raiding beehives for honey, and even attacking packs of lions.

Such a berserker attitude in so comparatively small a creature is admirable, but the kicker comes in the fact that the honey badger is actually more closely related to the skunk than badgers, and shares its gross ability to "reverse" its anus and shoot out jets of gross-smelling liquid that would almost certainly make you lose you lunch if you were ever to come across one. Best to give them a wide berth, no matter how cute their little faces undoubtedly are.

Back in 2009, just as the viral nature of the internet was truly hitting its stride, one of the grossest videos to ever hit the internet began doing the rounds (and we're talking about some stuff competition ... but we'll skirt around that for now). The footage seems to have come from deep in some anonymous sewer, and to show what looked like alien life ... a throbbing, pulsating, disgusting creature that no one could explain. Soon, the video began making headlines. "What are these hideous sewer flesh blobs?" asked the Metro newspaper, which noted that the creature seemed to be breathing, and that it resembled some gross "sphincter." To many, it looked like the inside of a great creature's throat, that moved in disturbingly large muscular movements.

Thankfully, the experts were at hand to save the internet from collective fever dreams of underground pipe-dwelling monsters. Per Deep Sea News, Dr. Timothy S. Wood identified the pulsating beast — or beasts, as they turned out to be — as "clumps of annelid worms, almost certainly tubificids (Naididae, probably genus Tubifex). Normally these occur in soil and sediment, especially at the bottom and edges of polluted streams. In the photo they have apparently entered a pipeline somehow, and in the absence of soil they are coiling around each other. The contractions you see are the result of a single worm contracting and then stimulating all the others to do the same almost simultaneously, so it looks like a single big muscle contracting."

The internet, of course, was grateful for Dr. Woods' conclusions on the matter. However, many users were then quick to draw another conclusion of their own: annelid worms are absolutely freaking gross, and no expert is going to tell us differently.