The Average IQ of a Crow: How Smart Are Crows Really?

How bird intelligence is actually measured

Researchers use behavioural tasks, not questionnaires. Here are the main tools of the trade, as of 2026:

The key discipline here is comparative cognition — running the exact task on both birds and children so the results sit on the same footing.

The real evidence, task by task

Tool use: crows that build their own tools

Most animals that "use tools" pick up something handy. New Caledonian crows go further — they manufacture them. In the wild and the lab they trim twigs into hooked probes and cut stepped tools from stiff pandanus leaves to winkle grubs out of crevices. They are the only non-primate species documented making tools with distinct, deliberate designs. Captive individuals have even bent straight wire into a hook to lift a food bucket — solving a problem the bird had never encountered in nature.

The Aesop's fable test: understanding water displacement

This is the study behind most of the "smart as a child" headlines. In a 2014 experiment published in PLOS ONE, Sarah Jelbert, Alex Taylor and colleagues gave New Caledonian crows the setup from the ancient fable: food floating out of reach on water inside a tube, with stones available. The crows dropped stones to raise the water and reach the reward — and they were selective about it. They preferred:

• dropping stones into a water-filled tube over a sand-filled one,
• sinking objects over floating ones,
• solid objects over hollow ones,
• the tube with the higher starting water level.

That's not trial-and-error luck; it's reasoning about cause and effect. The authors concluded the crows showed a "sophisticated, but incomplete" grasp of water displacement, rivalling that of 5-to-7-year-old children. Crucially, they failed the hardest versions — a task requiring them to judge the width of the tube, and a counter-intuitive U-shaped apparatus. That honest ceiling is exactly why "as smart as a 7-year-old" is a headline, not a full picture.

Recognising human faces (and holding grudges)

At the University of Washington, biologist John Marzluff ran a now-famous experiment: researchers wore a rubber "caveman" mask while trapping and banding wild crows, and a different neutral mask while doing nothing threatening. The masks controlled for height, clothing and route, so the only variable was the face. Afterwards, crows dive-bombed and scolded anyone wearing the "dangerous" mask — and kept doing it for years, with the reaction even spreading to birds that had merely watched the trapping, never being caught themselves. Crows can remember a specific human face for at least five years and pass that grudge socially through the flock. That combination of long-term memory plus social learning is genuinely rare in the animal world.

Planning for the future

For a long time, flexible planning for the future was considered a hallmark of humans and great apes. Then in 2017, Can Kabadayi and Mathias Osvath published a study in Science showing ravens (a corvid cousin of crows) plan too. The ravens learned to use a tool and to barter tokens for food — behaviours they don't perform in the wild — then chose and saved the correct tool or token to use up to 17 hours later, exercising self-control to skip an immediate smaller treat. In some versions of the task, the ravens outperformed 4-year-old human children. Because corvids and apes are only distantly related, this suggests complex planning evolved twice, independently.

Crows versus other clever animals

Where do crows sit among the animal kingdom's brainiacs? Roughly here, based on cognitive research rather than any single score:

Treat every "child years" cell as shorthand for one narrow task, not a general ranking. A crow that aces water displacement would be helpless at language, and a 7-year-old would be baffled by a pandanus leaf.

The honest bottom line

Crows and ravens are among the most intelligent non-human animals on Earth. They plan, reason about cause and effect, build tools, and remember faces for years — abilities once thought uniquely human or ape-like. The "as smart as a 7-year-old" line is a fair headline for specific reasoning tasks, and the more careful figure from the water-displacement work is 5-to-7. But there is no average IQ of a crow, because IQ simply isn't the right ruler. The truth is more impressive than the myth: a bird with a walnut-sized brain solving problems that stump most of the animal kingdom.

Frequently Asked Questions

Q: What is the average IQ of a crow?

A: There isn't one — and any specific number you see is invented. IQ is a scale normed on humans, so it can't be applied to a crow. What science offers instead is task-by-task comparison: on cause-and-effect reasoning like the Aesop's fable test, New Caledonian crows perform at the level of a 5-to-7-year-old human child.

Q: Are crows really as smart as a 7-year-old child?

A: On some tasks, yes; in general, no. The comparison comes from a 2014 PLOS ONE study on water displacement, where crows matched 5-to-7-year-olds. It applies to specific reasoning puzzles, not overall intelligence — crows have no language, reading, or abstract maths.

Q: Can crows actually recognise human faces?

A: Yes, and they remember them for years. University of Washington experiments showed wild crows recognising and scolding specific "dangerous" masked faces for at least five years, and even teaching that grudge to other crows who never saw the original event.

Q: What is the smartest bird?

A: Corvids (crows and ravens) and parrots top most lists. New Caledonian crows are famous for manufacturing tools, while ravens excel at future planning. African grey parrots are standouts for vocabulary and concept learning. There's no single "smartest," since each species leads in different cognitive skills.

References

• Jelbert, S. A., Taylor, A. H., Cheke, L. G., Clayton, N. S., & Gray, R. D. (2014). Using the Aesop's Fable Paradigm to Investigate Causal Understanding of Water Displacement by New Caledonian Crows. PLOS ONE, 9(3), e92895.
• Kabadayi, C., & Osvath, M. (2017). Ravens parallel great apes in flexible planning for tool-use and bartering. Science, 357(6347), 202–204.
• Cornell, H. N., Marzluff, J. M., & Pecoraro, S. (2012). Social learning spreads knowledge about dangerous humans among American crows. Proceedings of the Royal Society B, 279(1728), 499–508.

Last updated: July 13, 2026