There is no universally accepted collective noun for a group of octopuses, largely because octopuses are solitary creatures that rarely gather in groups at all. Unlike “a pod of dolphins” or “a murder of crows,” no term for grouped octopuses has been codified by long usage or scientific convention. That said, a few informal suggestions have floated around in popular writing and marine biology circles, and recent discoveries of large octopus gatherings in the deep sea have made the question less hypothetical than it used to be.
Why No Official Term Exists
Collective nouns in English tend to emerge for animals that people observe living, traveling, or hunting together. Wolves run in packs. Geese fly in flocks. Fish swim in schools. Octopuses, by contrast, spend most of their lives alone. They typically occupy solitary dens, hunt on their own, and show little tolerance for neighbors. When two octopuses do cross paths, the encounter is more likely to end in a fight or a quick retreat than in any cooperative arrangement. Because humans rarely saw octopuses grouped together, no term for a gathering ever took root in everyday language.
This is not a gap that formal taxonomy fills. Zoologists do not assign collective nouns the way they assign species names. Collective nouns are cultural artifacts, sometimes centuries old, rooted in the traditions of English hunting and natural history writing. Many of the fanciful ones people love to cite, like “a parliament of owls,” trace back to the fifteenth-century Book of Saint Albans rather than to any scientific source. Without a strong cultural tradition of observing octopus groups, no collective noun stuck.
The Terms People Use Anyway
When writers or aquarium educators need a word, a few options tend to surface. “Consortium” appears in some marine biology contexts, though it is not a formal designation. You will also see “tangle” in informal lists of collective nouns, a nod to the image of intertwined arms. And some people simply default to “group” or “gathering,” which are perfectly serviceable and carry no risk of pretending to a specificity that does not exist.
If you are writing a trivia quiz or a children’s book, you can pick whichever term you like. None is wrong because none is official. If you are writing for accuracy, the honest answer is that octopuses do not have a standardized collective noun, and any source that presents one as authoritative is dressing up a suggestion as a fact.
The Plural Question That Comes With It
Before you can talk about a group of them, you need to decide what to call more than one. The plural of “octopus” is one of the most reliably contentious questions in English usage, and the debate reveals more about how English absorbs foreign words than it does about cephalopod biology.
“Octopus” entered English from Greek via Latin. The Greek word is oktṓpous, meaning “eight-foot.” Because the word passed through Latin before arriving in English, many people assumed the Latin plural applied and wrote “octopi.” This is a reasonable guess but a linguistic error: the word is Greek in origin, not Latin, and Greek nouns do not pluralize with an -i ending. The correct Greek plural would be “octopodes,” which sounds delightful but strikes most English speakers as absurd. The standard English plural, formed the way English normally handles borrowed words, is simply “octopuses.” Major dictionaries and style guides accept “octopuses” as the default. “Octopi” is widespread enough to appear in dictionaries too, usually with a note that it results from a false assumption about the word’s origin. “Octopodes” is technically the most etymologically faithful but is almost never used outside of arguments about what the plural should be.
For practical purposes, “octopuses” is the safest choice. It is the one least likely to prompt a correction from a biologist, an editor, or the person sitting next to you at a dinner party who took Greek in college.
The Largest Known Octopus Gathering
The assumption that octopuses never congregate took a hit in 2018 when researchers documented a massive aggregation of the deep-sea species Muusoctopus robustus near an extinct volcano off the coast of central California. Using high-resolution subsea mapping, they found roughly 6,000 octopuses packed into a 2.5-hectare area around hydrothermal springs on the ocean floor. Females had migrated through cold, dark water to reach these warm seeps, where they mated, laid eggs, brooded them, and died. The warmth of the springs sped up embryonic development, cutting brood time to about 1.8 years, far shorter than what would be expected for octopuses living at abyssal depths and temperatures.1PubMed Central. Abyssal hydrothermal springs-Cryptic incubators for brooding octopus
This is not a social group in the way a wolf pack or a dolphin pod is. The octopuses are not cooperating, communicating in any organized way, or depending on one another. They are drawn independently to the same resource, the way sea turtles converge on the same nesting beach. Still, the sheer density of animals challenges the blanket statement that octopuses are always solitary. They can tolerate proximity when the reproductive payoff is high enough.
Other Species That Push the Solitary Label
The deep-sea aggregation is the most dramatic example, but it is not the only one. The Larger Pacific Striped Octopus (LPSO), a small species found off the Pacific coast of Central America, has long puzzled researchers because it appears to cohabit with mates and even share dens. Pairs of LPSO have been observed mating beak-to-beak, a position unusual among octopuses, which typically mate at arm’s length, presumably to reduce the risk of being eaten by the partner. During these encounters, females often enveloped the male partially or fully in their web, and the two grappled arms in what appeared to be a mix of mating and low-level aggression.2PLOS ONE. Behavior and Body Patterns of the Larger Pacific Striped Octopus
The LPSO is also unusual in that females can lay multiple clutches of eggs over their lifetime rather than the single terminal clutch that most octopus species produce. This extended reproductive life may favor longer-term pair associations, making the LPSO one of the closest things to a social octopus that researchers have found. Even here, though, “social” is a stretch. The animals tolerate each other. They do not organize, forage cooperatively, or form anything resembling a group with a stable structure.
In Australian waters, Octopus tetricus has been found in dense local populations at sites that researchers informally dubbed “Octopolis” and “Octlantis.” At these spots, octopuses live in unusually close quarters, den near one another, and interact frequently. These interactions are not friendly. They involve color displays, posturing, and sometimes physical grappling. But the fact that the animals remain near one another rather than dispersing suggests that certain environmental conditions, like abundant food and limited suitable den sites, can override the typical solitary instinct.
What Happens When Octopuses Actually Interact
When octopuses do encounter one another, they communicate through body color and posture in ways that are more structured than researchers once assumed. Field observations of Octopus tetricus showed that dark body color in an approaching octopus, met by pale color in the other, reliably predicted that the paler animal would retreat. When both animals went dark, the encounter was more likely to escalate to physical grappling. Octopuses also displayed on elevated ground, spread their webs, and raised their mantles, often combining several of these signals at once.3PubMed. Signal Use by Octopuses in Agonistic Interactions
This was the first study to document systematic signaling during aggressive encounters among octopuses, and the patterns matched predictions from established models of how animals resolve conflicts without resorting to costly fights. In other words, the octopuses were following something resembling a ritualized code: go dark to assert dominance, stay pale to signal submission, and escalate only when neither side backs down.4Current Biology. Signal Use by Octopuses in Agonistic Interactions
More recently, researchers studying Abdopus capricornicus, a small tropical species, documented the richest body-patterning repertoire seen in any coastal octopus so far: 10 distinct body patterns composed of 27 color components, 8 postural components, and 10 movement components, all used during social interactions.5Marine Biology. Octopus body language: body patterns of Abdopus capricornicus during social interactions This complexity suggests that octopuses living in dense populations may have been under selection pressure to develop nuanced ways of resolving conflicts without physical contact, a hallmark of species that interact regularly even if they are not cooperative.
How Octopuses Compare to Their More Social Relatives
Octopuses belong to the cephalopods, a class they share with squid, cuttlefish, and nautiluses. Among these relatives, octopuses are the outliers in their tendency toward solitude. Many squid species school in large groups, sometimes numbering in the thousands, and use coordinated body-pattern displays for communication. Caribbean reef squid and Pacific reef squid have been studied extensively in the wild, with researchers cataloguing specific combinations of color patterns and postures that function as signals directed at other members of the group.6Current Biology. Cephalopod behaviour
Cuttlefish, too, are more social than octopuses. They gather during mating season and engage in elaborate visual displays, including the ability to show different patterns on different sides of their body simultaneously, allowing a male to court a female on one flank while displaying a threat to a rival on the other. This kind of social signaling is more sophisticated than anything documented in octopuses, and it reflects the fact that squid and cuttlefish have had stronger evolutionary incentives to develop complex communication.
The solitary nature of most octopuses likely relates to their ecology. Octopuses are soft-bodied predators that rely on stealth, camouflage, and the protection of a den. Grouping up offers few advantages and significant risks: more competition for food, greater visibility to predators, and the constant threat of cannibalism. Squid, by contrast, live in the open water column where schooling provides safety in numbers and coordinated hunting pays off.
Individual Personalities and Social Learning
Even as loners, octopuses show individual variation in temperament that hints at a more complex inner life than their solitary habits might suggest. Researchers have documented clear personality differences among Octopus vulgaris in laboratory settings, finding that some individuals are bolder and more curious about new objects while others are cautious and slow to explore. In problem-solving tasks, such as opening a container to access food, bolder octopuses tended to succeed more readily, and the likelihood of success was positively linked to curiosity toward novel objects.7PubMed Central. Octopus vulgaris Exhibits Interindividual Differences in Behavioural and Problem-Solving Performance
Perhaps more surprising, octopuses can learn from watching one another. In a classic experiment, untrained Octopus vulgaris were allowed to watch trained demonstrators select a colored object. Afterward, the observers consistently chose the same object as the demonstrators, and they did so more rapidly than octopuses that had to learn the task from scratch through conditioning. This observational learning persisted for five days without reinforcement.8PubMed. Observational Learning in Octopus vulgaris The finding was significant because observational learning had previously been documented almost exclusively in vertebrates, particularly birds and mammals. That an invertebrate with a fundamentally different nervous system could pick up skills by watching a conspecific suggested that the capacity for social learning does not require a social lifestyle.
This raises an interesting tension. Octopuses are equipped with the cognitive hardware for social learning, yet they rarely encounter one another in the wild. One interpretation is that these abilities evolved primarily for non-social purposes, such as learning about predators or prey by observation, and are simply flexible enough to extend to watching another octopus. Another is that octopus social lives are richer than field observations have captured, particularly given how difficult it is to track well-camouflaged animals on the ocean floor at night, when many species are most active.
Why the Terminology Gap Persists
Languages tend to invent words for things people regularly encounter and need to distinguish. English has collective nouns for animals that medieval hunters, farmers, and naturalists watched in groups because naming those groups was practically useful or at least socially fashionable. Octopuses live underwater, are active mainly at night, are masters of camouflage, and almost never cluster. For most of human history, seeing even one octopus was unusual. Seeing a group was essentially unheard of outside of a fish market.
The recent discoveries of large gatherings in the deep sea and dense populations at sites like Octopolis have changed the scientific picture, but these findings are too new and too niche to have generated a collective noun through natural linguistic evolution. If octopuses had been observed in groups for centuries, the way starlings or geese have been, English would almost certainly have a word for a group of them by now. Instead, we are left with a handful of suggestions, none of them authoritative, for a phenomenon that most octopus species do not regularly produce. The absence of a term is itself a piece of information about how these animals live.