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There is no scientifically defensible overall winner among octopuses, parrots and crows. The studies available for these animals use different species, tasks and settings, so they do not produce a shared intelligence score. A fair comparison instead asks which abilities each animal has demonstrated—such as learning, physical problem-solving, tool use, social cognition or communication—and how strong the evidence is for each claim.
On that task-by-task basis, octopuses show striking flexibility in physical problems, corvids have extensive evidence for sophisticated tool and social cognition, and parrots belong to the same broad literature on complex avian cognition without being reducible to vocal mimicry. Those are different cognitive profiles, not positions on one ladder.
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Why “intelligence” cannot be treated as one number
In comparative biology, intelligence is not a single laboratory variable. Researchers measure separate capacities: learning a rule, remembering an event, adapting when conditions change, manufacturing or using a tool, inferring what another animal knows, or choosing an efficient action. An animal can excel in one domain and be unremarkable in another. A puzzle solved quickly therefore does not establish a universal ranking over every kind of cognition.
Test design also shapes the result. A controlled laboratory experiment can reveal whether an individual learned a sequence under repeatable conditions. A field observation can show that an animal uses an object in its natural environment, but usually cannot isolate whether the behavior involved planning, trial and error, or a simpler learned routine. A review can integrate many findings while still covering several species and methods. These forms of evidence answer different questions and should not be converted into an IQ-like score.
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The labels themselves are broad. “Octopus” can mean multiple cephalopod species; “parrot” covers a large and diverse bird group; and “crow” is often used informally for a wider set of corvids. A result from one species should be identified as such rather than silently generalized to an entire branch of the animal tree.
What octopus studies actually show
A five-level physical puzzle in Octopus vulgaris
A primary experiment published in PeerJ in 2016 tested seven common octopuses (Octopus vulgaris) on an L-shaped food container. The animals had to manipulate the container to reach the food, and the researchers changed its orientation and experimental conditions across five task levels. All seven subjects learned the task sequence and adapted as the physical arrangement changed. The study presents this as evidence of learning and behavioral flexibility in that particular puzzle, not as a population-wide estimate of octopus intelligence. (Richter et al., “Pull or Push? Octopuses Solve a Puzzle Problem,” PeerJ, 2016)
“Flexibility” is the careful description because the experiment measured successful adaptation to changing task conditions. It did not directly measure an internal plan, a verbalizable rule, or a human-like concept of the container. The observed behavior is robustly interesting without requiring a stronger claim about what the octopus consciously represented.
Carrying shells: tool use with an interpretation boundary
Field observations of veined octopuses carrying coconut shells are often cited as an example of tool behavior. A comparative cephalopod review describes the shells functioning as mobile dens: the octopus transports an object and later uses it for protection. That behavior is compatible with flexible tool use because the object is acquired, carried and deployed for a later purpose. (Schnell et al., “How intelligent is a cephalopod? Lessons from comparative cognition,” Biological Reviews, 2020)
It is a further interpretive step to say the observation proves future planning. The observation establishes what the animal did; it does not by itself identify the mental process that produced the behavior. Planning would normally require tests that distinguish anticipation of a later need from immediate reinforcement, inherited routines or other explanations.
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Learning evidence and its limits
The same cephalopod review describes substantial evidence for learning and memory across cephalopods, while emphasizing that the field has fewer cognitive data than research on many vertebrates. The 2016 puzzle paper explicitly noted that experimental evidence on octopus cognition was still scarce at that time. Octopus experiments can be technically difficult because subjects differ in motivation, handling tolerance and response to laboratory conditions. A small, carefully controlled study can establish that the tested animals learned a task; it cannot establish how every octopus would perform or settle questions about subjective experience.
Social context matters as well. Many cephalopods live in comparatively simple social environments, so a simple “social brain” explanation cannot account for every flexible behavior they show. Their abilities raise a broader comparative question: complex cognition may evolve under ecological pressures other than constant group living. That conclusion concerns possible evolutionary routes, not a claim that octopuses and birds use identical mechanisms.
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Tool manufacture is more than tool use
Crows belong to the corvid family, which also includes ravens, rooks, jays and related species. The influential review by Nathan J. Emery and Nicola S. Clayton examines corvid cognition through several domains, including tool manufacture, social cognition and what researchers call mental time travel. Manufacturing a tool is a different outcome from picking up an available object: it requires selecting or modifying material so that it performs a function. The review treats these abilities as parts of a cognitive toolkit rather than as evidence for one scalar intelligence trait. (Emery and Clayton, “The mentality of crows: convergent evolution of intelligence in corvids and apes,” Science, 2004)
“Mental time travel” is a research term for behavior related to representing past events or anticipating future situations. A review discussing that concept is not the same as a single experiment proving that every crow consciously replays memories or imagines the future. The appropriate conclusion is that corvid research has developed tests aimed at these capacities and has found a complex pattern of physical and social problem-solving.
Social cognition is a major part of the corvid literature
Corvid studies examine how birds respond to competitors, track social relationships and use information in group settings. Such tasks can be ecologically meaningful because food storage, competition and cooperation create pressures to remember individuals and locations. But “social cognition” still covers multiple processes: recognizing a rival, learning from another animal, understanding access to a resource, or adjusting behavior after a social encounter are not interchangeable abilities.
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Emery and Clayton summarize the evolutionary implication this way: “Because corvids and apes share these cognitive tools, we argue that complex cognitive abilities evolved multiple times in distantly related species with vastly different brain structures in order to solve similar socioecological problems.” (Science review record) The point is convergence—similar functional challenges can favor complex abilities in very different nervous systems—not that a crow has an ape mind or that all corvid species perform identically.
Do corvid results apply to every crow?
Not automatically. Corvid reviews often group evidence from several species, and a result in a raven, scrub-jay or rook may not have been tested in a particular crow species. When a source uses “corvids,” report that level of taxonomic precision. When a reader asks specifically about a crow, distinguish findings demonstrated in crows from conclusions inferred from the wider family.
Where parrots fit in the comparison
Parrots are part of complex avian-cognition research
A 2020 review of avian cognition discusses complex cognitive processes studied in both parrots and corvids. It recommends using multiple assessments to understand cognition within a species and to compare species. That approach places parrots squarely in the comparative-cognition conversation while avoiding the assumption that one spectacular behavior represents an entire mind. (“Convergent evolution of complex cognition: Insights from the field of avian cognition into the study of self-awareness,” PubMed record, 2020)
The review-level evidence supplied here does not provide a directly matched parrot-versus-octopus experiment, nor does it establish a single quantitative result for parrots versus crows. It supports the narrower, evidence-based statement that parrots have been included in research on complex cognitive processes and that their abilities should be assessed across more than one task.
Why vocal mimicry is an incomplete shortcut
Parrots are often judged by how accurately they copy human speech. Vocal imitation can be behaviorally impressive, but mimicry alone does not measure memory, causal reasoning, physical problem-solving or social understanding. Conversely, an animal that does not imitate human speech is not thereby less intelligent. A fair comparison asks what a parrot does on the specific task being discussed and whether that task has been administered comparably to another species.
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What cannot be claimed from the current comparison
The avian review does not supply a head-to-head score against the seven-octopus puzzle study, and it does not justify saying that parrots rank above or below crows in every domain. Parrots and corvids are both diverse groups; performance can vary with species, individual history, motivation and testing method. The responsible use of the review is to broaden the set of abilities considered, not to manufacture a league table.
Domain-by-domain comparison
| Domain | Octopuses | Parrots | Crows and other corvids | How to read the evidence |
|---|---|---|---|---|
| Learning and memory | Cephalopod literature reports substantial learning and memory; seven O. vulgaris learned and adapted in a five-level container task (2016 experiment; 2020 review). | Included in reviews of complex avian cognitive processes, but no directly matched result with the octopus task is provided (2020 avian-cognition review). | Reviews cover several physical and social abilities across corvid species (Emery and Clayton). | Do not translate separate learning paradigms into one ranking. |
| Physical problem-solving | Seven animals solved a changing container puzzle; the result is specific to the tested species, sample and design (PeerJ, 2016). | The supplied review establishes broad coverage of complex tests, not a matched physical-puzzle score (PubMed). | Corvid literature discusses flexible physical cognition and tool-related tasks (Science review). | A puzzle, a field task and a review synthesis answer different questions. |
| Tool behavior | Veined octopuses have been observed carrying coconut shells as mobile dens; planning is an interpretation, not a direct measurement (Biological Reviews, 2020). | The supplied avian review does not provide a specific parrot-versus-octopus tool comparison (PubMed). | Corvid reviews discuss tool manufacture as well as related flexible behavior (Emery and Clayton). | Tool use and tool manufacture should be reported separately. |
| Social cognition | Many cephalopods live in comparatively simple social environments, so sociality alone cannot explain their flexibility (Schnell et al.). | Parrots are included in complex avian-cognition research, but the supplied source gives no detailed three-way social comparison (2020 review). | Social cognition is an explicit topic in corvid research (Emery and Clayton). | Explain social and ecological context without treating group living as the only route to complexity. |
| Evidence strength | One small primary experiment plus broader reviews; the 2016 paper noted that cognitive data were scarce at that time. | Primarily review-level support in the supplied material; no matched quantitative sample. | Much of the support is review-level and combines multiple corvid species. | State whether a claim comes from an experiment, an observation or a review. |
Why evolutionary history prevents a simple ladder
More than 550 million years of separate evolution
Coleoid cephalopods diverged radically from vertebrates over more than 550 million years, according to the comparative cephalopod review. That number is evolutionary context, not a measurement of cognitive distance. It tells us that similar-looking abilities can arise in lineages with very different nervous systems. (Schnell et al., 2020)
Because their bodies, habitats and histories differ, the animals face different problems. An octopus may need to manipulate objects in a three-dimensional marine environment; a corvid may exploit tools, caches or social information; a parrot may solve tasks shaped by a mobile, vocal and socially engaged lifestyle. A test designed around one ecology can advantage one group for reasons that say little about a general-purpose mental capacity.
Convergence does not mean identical minds
When unrelated animals solve analogous problems, comparative biologists call the pattern convergent evolution. Convergence can produce similar outcomes—such as flexible object use—through different underlying mechanisms. It is therefore valid to compare the behavior while remaining cautious about claims that the animals “think the same way.”
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- Name the species. Replace broad labels with the actual animal studied, such as Octopus vulgaris or a named corvid species. If a review combines species, say so.
- Name the task domain. Ask whether the evidence concerns learning, memory, physical problem-solving, tool use, tool manufacture, social cognition or communication. Do not let success in one domain stand for all others.
- Describe the setting and sample. A controlled puzzle with seven animals, a field observation of shell carrying and a multi-species review have different evidentiary scopes. Include the sample and design when they are known.
- Separate observation from interpretation. “The octopus carried a shell and later used it as a den” reports behavior. “The octopus planned for a future need” is a hypothesis that requires additional tests.
- Check ecological fit. Decide whether the task reflects a problem the animal normally encounters. A poor performance on an unfamiliar apparatus may reveal little about abilities expressed in the wild.
This checklist also prevents a common error: treating a review’s list of cognitive topics as if it were a single experiment with a single score. Reviews are valuable for mapping a field, but their conclusions must retain the limits of the underlying studies.
How to read common comparisons
“Is a crow smarter than an octopus?”
The question has no answer until “smarter” is replaced with a task. Corvid research offers extensive discussion of tool manufacture and social cognition, while the octopus experiment demonstrates learning and adaptation in a changing physical puzzle. Those findings show different strengths under different methods; they do not establish that one animal would outperform the other on every cognitive test.
“Does shell carrying prove that an octopus plans ahead?”
It demonstrates mobile-object use that is compatible with flexible tool behavior. The planning claim goes beyond the observation. To support it directly, an experiment would need to distinguish anticipation of a later need from simpler explanations such as learned reinforcement or immediate shelter-seeking.
“Are parrots intelligent only because they imitate speech?”
No. The avian-cognition literature treats parrots as subjects in studies of complex cognitive processes and recommends multiple assessments. Vocal imitation is one behavior; it should neither be used as the sole proof of intelligence nor dismissed as irrelevant without examining what the specific task measures.
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What stronger evidence would look like
A genuinely quantitative three-way comparison would test octopuses, parrots and crows with matched procedures, comparable motivation controls, preregistered scoring and samples large enough to estimate variation within each group. It would also need tasks that do not unfairly depend on a particular body plan, sensory system or social environment. The sources considered here do not provide such a study, so a universal ranking would overstate what is known.
What the evidence supports
Octopuses have demonstrated learning and adaptation in a changing physical problem, and veined octopus shell carrying is consistent with flexible tool behavior. Corvid research documents a broad program on tool manufacture, social cognition and related abilities. Parrots are represented in reviews of complex avian cognition that caution against judging any species with a single test. The most accurate comparison is therefore a set of task-specific profiles: different strengths, measured in different ways, with no common score that places all three groups on one universal intelligence ladder.
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