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Animal lists · 12 entries

The Smartest Animals on Earth

Ranked by demonstrated problem-solving, tool use and social learning in controlled studies, chimpanzees and other great apes lead among non-human animals — but intelligence is not one score, and corvids, dolphins and octopuses excel in specific cognitive tasks that apes do not.

Updated 25 July 2026

Animal intelligence is not a single ladder. A pigeon beats a chimpanzee at certain pattern-recognition tasks. An octopus solves mazes but lives alone and dies after breeding. Ranking "smartest" without specifying the cognitive skill being tested produces a list that sounds authoritative and means very little.

This list ranks species by breadth of demonstrated cognitive ability across multiple domains — tool use, social learning, problem-solving, communication and memory — as documented in peer-reviewed research. Domestic dogs are excluded because their skills are the product of artificial selection for human interaction rather than wild cognition.

How this list was compiled

Entries are ranked by breadth of cognitive abilities demonstrated in controlled experiments and long-term field studies, not by brain size or anecdote. Specific skills — tool manufacture, mirror self-recognition, episodic memory — are noted per species. Domesticated animals bred for human-directed behaviour are excluded. Claims from single unreplicated studies are flagged. Intelligence in one domain does not imply superiority in all domains.

The Smartest Animals on Earth

  1. Chimpanzee

    Tool use, planning, social manipulation

    Manufactures and modifies tools, cooperates in hunting, shows political behaviour in social groups.

  2. Bonobo

    Social cognition, language research

    Passes mirror self-recognition tests. Lexigram studies show symbolic communication capacity.

  3. Orangutan

    Tool use, delayed gratification

    Wild orangutans prepare tools hours before use — evidence of forward planning rare outside great apes.

  4. Dolphin

    Mirror self-recognition, cooperative hunting

    Passes mirror tests. Bubble-net feeding demonstrates coordinated planning.

  5. Crow

    Tool manufacture, causal reasoning

    New Caledonian crows bend wire into hooks to extract prey — tool making without training.

  6. African grey parrot

    Symbolic communication, number concepts

    Alex the parrot demonstrated label comprehension and counting in controlled trials. Generalisation across individuals is debated.

  7. Elephant

    Self-recognition, cooperation, memory

    Passes mirror tests. Matriarchs remember water sources across decades of drought.

  8. Octopus

    Problem-solving, escape behaviour

    Opens jars, navigates mazes, uses shells as shelter. Most cognition is solitary rather than social.

  9. Pig

    Spatial memory, joystick tasks

    Outperforms dogs on some spatial tasks and learns to manipulate joysticks in laboratory settings.

  10. Rat

    Learning, empathy experiments

    Learns complex mazes quickly. Freezes trained rats have been shown to release trapped cage-mates.

  11. Border collie (working dogs)

    Word learning (~1,000+ object names)

    Rico and Chaser learned hundreds of object names. This reflects training and selection, which is why wild canids are listed separately.

  12. Raven

    Planning, bartering, theory of mind tests

    Caches tools for future use and trades tokens in experiments — evidence of planning beyond immediate reward.

Key facts

  • Intelligence is domain-specific — corvids outperform apes on some tasks while apes dominate social and tool-use cognition.
  • Great apes lead in breadth of demonstrated cognitive skills across tool use, planning and social manipulation.
  • Brain size alone is a poor predictor; corvids and parrots achieve comparable feats with much smaller brains.
  • Domestic dogs excel at human-directed tasks but that reflects breeding, not necessarily wild cognitive breadth.
  • Mirror self-recognition — passing the mark test — is documented in apes, dolphins, elephants and magpies, not in most species.
  • Single famous individuals (Alex the parrot, Koko the gorilla) demonstrate capacity but cannot represent an entire species without replication.

The Smartest Animals on Earth: frequently asked questions

What is the smartest animal after humans?
By breadth of demonstrated cognitive skills in research, chimpanzees and other great apes lead. But corvids, dolphins and octopuses match or exceed apes in specific domains such as tool manufacture or problem-solving.
Are dolphins smarter than dogs?
In wild cognition — self-recognition, cooperative hunting, communication complexity — dolphins generally rank higher. Dogs excel at reading human social cues, which is a different and bred skill.
How do scientists measure animal intelligence?
Through controlled experiments: tool-use tests, mirror self-recognition, maze learning, delay-of-gratification tasks, and observation of wild behaviour such as tool manufacture and cooperative hunting.
Are crows really that intelligent?
Yes, by any non-human standard. New Caledonian crows manufacture hook tools from wire or pandanus leaves without training, and several crow species pass causal reasoning tests that stump young children.
Do octopuses have intelligence?
They show sophisticated problem-solving — opening jars, navigating mazes, escaping enclosures — but most cognition is individual rather than social, and their lifespan limits long-term learning.
Why are pigs on this list?
Pigs perform well on spatial memory tasks, learn to use joysticks, and show behavioural responses consistent with empathy in laboratory studies. They are among the most cognitively capable farm animals.

Sources

How we check facts: our sourcing standards →

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