Buzz
Sometimes, evolution takes an unexpected turn, leading to creatures that leave us both baffled and amazed. While some outcomes are incredible, like the octopus, others are more disconcerting, like the bobbit worm.
Occasionally, evolution produces animals that are so oddly designed that we start to wonder if nature itself was having an off day. These creatures appear so ill-suited for survival that it’s a marvel they exist at all, thriving despite their ridiculous forms or behaviors.
10. Horse
When we think of horses, speed is often the first attribute that comes to mind. These animals have been bred for strength and agility, their bodies fine-tuned for racing, pulling, and leaping. We’ve carefully chosen and molded them to be quick and powerful, so one might expect them to be perfectly built for such activities.
Sadly, horses drew the short straw when it comes to their physical design. While they can reach speeds of 80–89 kilometers per hour (50–55 mph), which is about twice as fast as the fastest human, it comes at a price: a horse that sustains such speed for more than a few minutes can experience bleeding in its lungs and throat.
Though their bodies are built for speed and power, horses are surprisingly delicate. When they push their limits or exercise for too long, they develop “exercise intolerance,” a condition that makes every breath painful. The strain on their lungs while gasping for air causes blood vessels to rupture, leading them to cough up blood.
Once this occurs, the only remedy is to stop them from running entirely.
9. Koala
Herbivores form a unique group of animals. Eating a plant-based diet that wears down the teeth requires specialized adaptations. Some, like rodents such as rats and hamsters, have teeth that grow continuously. Others, like horses, have teeth that are incredibly tall and wear down over many years.
On the other hand, koalas . . . are in a difficult spot. With small, smooth brains that limit their ability to perform complex tasks, and an incredibly selective diet consisting only of the toxic, low-nutrient leaves of the eucalyptus tree, koalas also possess a single, stationary set of small, jagged teeth.
As time passes, the tough, fibrous eucalyptus leaves gradually wear down their teeth until only the gums remain. Unable to eat anything else, the koala ultimately succumbs to starvation.
8. Sunfish
The ocean sunfish (also known as mola) is one of those rare creatures that seems to serve no real purpose on this Earth. With their large eyes and lips, along with their odd teeth that prevent them from closing their mouths, they are truly strange.
Moreover, they are highly susceptible to parasites and predators, though they don't have many to worry about. The massive 4.3-meter (14 ft), 2,300-kilogram (5,000 lb) fish survives on a diet of algae, plankton, and jellyfish, all of which are low in nutrients, making them the fish equivalent of lettuce.
This unfortunate creature also lacks a swim bladder, an essential organ that almost all fish have to help them float. The sunfish compensates for its absence by relying on a layer of jelly under its skin, which makes it neutrally buoyant.
In fact, the sunfish's primary survival strategy is to lay up to 300 million eggs at once. While impressive, it’s a rather passive approach—essentially releasing all the eggs into the water near a male and hoping they get fertilized and survive to hatch.
7. Cheetah
The cheetah is one of nature's most fascinating predators. We picture them racing across the African plains, pouncing on prey with swift and precise movements. They are often seen as powerful, speedy hunters, always ready for action.
Despite our admiration for them, there's a slight fear that comes with the cheetah’s image. With their sharp claws, keen teeth, and lightning-fast speed, we tend to associate them with lions, imagining them as fearless hunters capable of staring death in the face and devouring villages whole with a quick chirp.
Luckily for us, we don’t need to worry too much, because cheetahs have a surprising characteristic: extreme anxiety. In captivity, they become so stressed simply by existing that they struggle with socializing and reproduction. This has led many zoos worldwide to pair them with support dogs to help ease their anxiety and improve their social interactions and breeding.
Fortunately for the cheetahs, these support dogs are more than willing to help, and the relationship seems to pose no threat to either species.
6. Sea Snakes
Water everywhere, yet not a drop to drink!
Sea snakes are exactly what their name implies: snakes that inhabit the sea. These peculiar creatures glide along the surface of the ocean, moving as though the water is solid ground. They feast on fish and give birth, but despite living in saltwater, you’d expect them to drink it.
But that’s not the case. Sea snakes are typically in a state of mild dehydration. They cannot drink saltwater and instead rely on rainwater. When it rains, fresh water, being less dense, sits atop the saltwater, offering the snakes a chance to hydrate.
When this happens, the snakes eagerly drink their fill. However, as rain is infrequent on the open ocean, these creatures often endure long periods of thirst, bordering on dehydration.
They also cannot venture onto land and either cannot or simply refuse to swim into freshwater streams and rivers.
5. Giant Squid
The giant squid is one of the few true sea monsters lurking in the depths. With eyes as large as basketballs and the ability to reach speeds of up to 32 kilometers per hour (20 mph), this colossal creature is not only huge but also incredibly fast and terrifying. It devours up to 227 kilograms (500 lb) of food daily, including fish, sharks, and even smaller squid.
However, this impressive cephalopod is not without its fatal flaw: Its throat runs directly through its brain. If the squid attempts to swallow prey too large, the bulging food passes through the brain, causing pressure on delicate tissues. This can result in brain damage as the swallowed item presses against the brain and the surrounding tissues.
For this creature, biting off more than it can chew can spell its end.
4. Kakapo Bird
Picture for a moment that your entire chance of finding a mate depends on the number of berries ripening near your home. Worse yet, even if the berries are abundant, there’s a slim chance of success. Welcome to the life of the kakapo parrot, the only flightless parrot in existence and the most hapless bird in New Zealand.
Regarded as a sacred bird by the local Maori people, the kakapo remains a baffling enigma of evolution. It’s flightless, nocturnal, and has bulky thighs ideal for climbing trees. However, these traits leave it defenseless against predators like weasels, cats, and feral dogs. But the truly perplexing aspect of the kakapo’s life is its mating rituals.
Every two or three years, and sometimes as long as five, a particular berry known as the rimu fruit blooms on the islands where these birds reside. The kakapo can only mate during a favorable blooming season of these fruits.
The male kakapos create large, resonating bowls and emit loud, booming “BOW” calls to attract females. However, if his calls aren’t loud enough or if there isn’t enough rimu fruit in bloom, the females will ignore him. With infertility rates so high, this only worsens their situation. Currently, there are just over 150 wild kakapos.
3. Humans
Ah, humanity. We take great pride in ourselves as a species. Intellectually, we are quite sound. Our brains aren’t perfect, but we’re certainly intelligent. After all, we’ve built computers and even ventured into space. However, our physical form leaves much to be desired.
For instance, our feet are composed of 26 separate bones, a leftover from our primate ancestors. This makes our feet extremely fragile and surprisingly easy to injure, as they were originally designed for gripping and relied on our hands to help support our weight.
Our ankles are delicate, often turning outward with the slightest misstep, making it easy to sprain or even break them. Similarly, our spines aren’t designed to handle the weight they bear. A series of curves and unusual proportions often lead to back problems in our twenties and almost inevitably in our forties or fifties.
We are also burdened by the challenge of giving birth to live young with heads and torsos that are larger than our birth canals are naturally built to accommodate, and proportionally twice as large as the offspring of most other animals. Today, nearly a third of human births are performed via C-sections.
2. Whales
It is widely accepted that life began in the sea. Creatures were born, evolved, and crawled onto land, eventually becoming mammals. But some of these mammals, though content on land, still yearned for the sea. Enter: the whale.
The oldest-known ancestor of the whale is the Indohyus, an animal that resembled a spotted anteater. Over time, this creature made its way back to the water, evolving fascinating aquatic adaptations.
However, it didn’t lose its mammalian traits. The new fish-like creature, which would later evolve into the whale and the dolphin, still required air to breathe and lungs instead of gills, both of which are problematic for a creature living a fish-like existence.
1. Great White Sharks
Few creatures spark the imagination of ocean enthusiasts like the great white shark. With its massive jaws, razor-sharp teeth, and powerful muscles, the shark has become a staple in horror and action films throughout the years. It’s also widely known that sharks must keep moving in order to breathe.
What might surprise you, though, is that this rule applies even when the great white is sleeping. As obligate ram ventilators, these sharks must keep water flowing through their gills at all times.
To achieve this, they have an unusual method of sleeping. They lie in a current with their mouths open, allowing the water to pass through their gills, effectively breathing for them as they rest. It’s like needing a ventilator just to take a nap.
