If you think you know everything about octopuses, think again—here are 10 freaky facts that prove these eight‑armed marvels are far stranger than most people imagine.
10 They Get Oxygen Blindness
10 freaky facts: Oxygen Blindness
During daylight hours, many Pacific octopus species hide deep beneath the waves to evade predators and harsh sunlight. When night falls, they ascend toward the surface to hunt. In 2019, scientists captured larvae of these creatures—octopuses, crabs, and squids—to examine how varying oxygen levels impact visual acuity.
Oxygen is essential for converting photons into neural signals. The deeper the animal dives, the less oxygen is available, making vision increasingly compromised. The experiment demonstrated that oxygen plays a far more pivotal role in cephalopod sight than previously recognized.
Researchers equipped the youngsters with tiny electrodes on their eyes and exposed them to a bright light cue while gradually lowering dissolved oxygen from full saturation (surface levels) down to a mere 20 %—far below what they normally encounter. [1]
The outcome was alarming: every cephalopod and crustacean suffered severe vision loss, with some becoming completely blind. After restoring normal oxygen, all subjects regained between 60 % and 100 % of their eyesight within an hour. The findings raise serious concerns, as climate‑driven ocean deoxygenation could usher in a future where these creatures wander blind and vulnerable.
9 The Farm Fight
Rising consumer demand for octopus on dinner plates has spurred a push to cultivate them in captivity. Harvesting wild octopuses remains unpredictable, and fishers struggle to satisfy global appetite, prompting seafood firms to explore farming as a solution.
However, both scientists and psychologists warn that octopus aquaculture would be a disastrous gamble. Unlike traditional livestock, octopuses require live prey during their juvenile stage, and adult individuals need a diet of high‑protein, meat‑rich foods—placing immense pressure on already stressed fisheries.
Experts predict that captive breeding for human consumption would jeopardize food security, generate pollution, encourage inbreeding, spread disease, and inflict psychological trauma on creatures intelligent enough to recognize individual humans and solve intricate puzzles. [2]
8 Male Murder
Octopuses are famed for their extraordinary abilities, yet their love lives can be lethal. In many species, courting males risk being strangled or devoured by the very females they pursue.
To increase their odds, males have evolved a suite of tactics. In less aggressive species, a male shortens his specialized mating arm and embraces the female with all eight limbs before transferring sperm. In more combative species, the male retains a longer arm, delivering sperm from a safer distance.
Some algae‑dwelling octopuses face particularly hostile females and larger rival males. Smaller suitors employ a clever ruse: they masquerade as females, concealing their elongated mating arm while nestling close to the real female, thereby avoiding detection.
Other species, such as the argonaut and blanket octopuses, take extremity to the next level—detaching their mating arm inside the female’s mantle and making a hasty escape before the female can retaliate. [3]
7 They Walk On Land
Although octopuses are primarily marine, they occasionally venture onto dry ground. Documented footage shows them slipping between isolated pools, but because they are nocturnal, such terrestrial forays are rarely observed.
In a puzzling 2017 incident, dolphin watchers on Wales’ Ceredigion coast returned to the beach around 10 p.m. to find more than twenty octopuses meandering across the sand, a sight that raised eyebrows among the observers.
While octopuses can survive out of water for a few short minutes, these individuals did not make a beeline for nearby tide pools or the sea. The following day, several were rescued, but a few succumbed to the unfamiliar environment. The exact cause of this mass stranding remains uncertain, though hypotheses include disease, disorientation from a storm, or other environmental stressors. [4]
6 World’s Most Adorable Octopus
In 2018, researchers from Hawaii’s Kaloko‑Honokohau National Historical Park were surveying nearby reefs when a floating piece of plastic snagged their attention. Upon retrieving the debris, they discovered a pair of infant octopuses hitching a ride.
One of the hatchlings was irresistibly cute—about the size of a pea, its freckled arms and oversized eyes perched delicately on a scientist’s fingertip. Photos of the tiny marvel quickly went viral, earning the little creature a legion of online admirers.
The second hatchling, however, displayed a far more ruthless side of nature. While the researchers observed, the miniature octopus was seen clutching and crushing a similarly tiny crab, demonstrating that even the smallest predators can be ferocious. Both youngsters were later released into a protected zone of the reef. [5]
5 The Kayak Incident
During a 2018 kayaking adventure off New Zealand’s coast, two friends captured a surreal moment on video. As one paddler filmed the other, a seal suddenly surfaced nearby and, with surprising precision, hurled a sizeable octopus directly at the camera‑holder’s face.
The startled kayaker appeared to relish the bizarre attack, shouting triumphantly as the cephalopod struck him. Scientists suggest the seal’s behavior was likely an attempt to tenderize a tough meal.
Octopuses are notoriously resilient prey; even after death, their suction cups cling stubbornly to any surface, posing a choking hazard for predators. Seals typically mitigate this by smashing or tossing their catch to dislodge the suckers, a technique the seal may have applied to the unsuspecting human.
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4 Paul’s Movie
During the 2010 FIFA World Cup, Paul the octopus captured global attention by correctly predicting every match outcome. After his death in October of that year, filmmaker Jiang Xiao alleged a cover‑up, claiming the aquarium had swapped the real Paul for a dead double months before the final.
According to Xiao, the staff at Germany’s Oberhausen Sea Life Center grew nervous when her documentary probed the mystery, prompting them to replace Paul with a look‑alike to preserve the spectacle. The aquarium, however, refuted the claim, insisting that Paul died of natural old age at roughly 2.5 years—typical for octopuses—and was subsequently cremated. Visitors can now view his urn and watch archival footage while signing a condolence book.
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3 The Space Report
In 2018, a sweeping review authored by 33 scientists appeared in Progress in Biophysics and Molecular Biology. While the paper was rigorously peer‑reviewed and heavily cited, its central claim sparked controversy.
The authors proposed that octopuses (and squids) might have extraterrestrial origins. Their hypothesis suggested that cephalopod eggs were ejected into space, became encased in cometary ice, and remained in cryogenic stasis until the comets collided with early Earth hundreds of millions of years ago, allowing the eggs to hatch and seed our oceans with intelligent mollusks.
Although the notion of panspermia—life traveling via celestial bodies—is gaining scientific traction, the octopus‑specific version remains on the fringe. More concrete evidence is needed before the theory can graduate from speculative to accepted.
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2 The Perfect Escape Plan
When a New Zealand fisherman hauled up a crayfish trap, he discovered a battered octopus inside—roughly the size of a rugby ball, its arms scarred from previous battles. The creature, later named Inky, was taken to a national aquarium where staff noted evidence of prior fights with reef fish.
Inky quickly became a crowd favorite due to his charismatic demeanor and evident intelligence. Years later, an accidental oversight left the top of his tank ajar. Seizing the opportunity, Inky slipped through the opening, slithered across the floor, and navigated a four‑meter stretch before locating a drainpipe.
Following the pipe for roughly 50 meters, the octopus emerged back into the ocean. Although no eyewitness captured the escapade, security footage and the tank’s layout suggest that Inky’s escape was self‑initiated, showcasing the legendary Houdini‑like abilities of octopuses, whose lack of a rigid skeleton lets them squeeze through impossibly tight gaps.
1 Skin Dreams
Octopuses never cease to astonish, and a 2017 recording from Colorado’s Butterfly Pavilion proved just how bizarre they can be. The exhibit houses a Caribbean two‑spot octopus, known for its rapid color‑changing prowess, which scientists use to study camouflage and communication.
One night, a caretaker captured the creature while it was asleep. The video showed the octopus’s skin transition from a blank white to pulsating dark patterns that synced with its breathing, then flooding the body with near‑black before fading back to white.
The striking display occurred during sleep, prompting researchers to wonder whether the octopus was dreaming. Scientists are now investigating cephalopod sleep cycles, hypothesizing that these animals might experience dream‑like states despite lacking a centralized brain; instead, their neural networks are distributed throughout their arms.
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