🦅Ornithology·15 min·Sample Lesson

Corvids Intelligence Puzzles

A crow in New Caledonia bends a straight piece of wire into a hook, then uses it to fish a piece of food out of a narrow tube - a tool it invented on the spot, something scientists once thought only humans and chimpanzees could do. Crows, ravens, magpies, and jays are all corvids, and pound for pound, their brains rival some primates for problem-solving power.

What You'll Learn

By the end of this lesson, you will be able to: Describe how New Caledonian crows make and use tools in the wild Explain what the Aesop's Fable water test shows about corvid problem-solving Describe how crows recognize and remember individual human faces

Tool Makers of the Bird World

New Caledonian crows, found on islands in the South Pacific, are famous for making hooked tools out of twigs and even bending garden wire into hooks in laboratory tests, something researchers at Oxford first documented with a crow named Betty in 2002. In the wild, these crows carry favorite tools between feeding spots and even store them for later use, much like a person keeping a favorite screwdriver in a toolbox.

The Aesop's Fable Test

In an old fable, a thirsty crow drops stones into a jug of water until the water rises high enough to drink. Scientists actually tested this with real crows and ravens: they put a floating treat in a tube of water too low to reach, then gave the birds stones and other objects to work with. Several corvid species solved it - choosing to drop sinking stones rather than floating corks, and larger stones over smaller ones, because they raised the water level faster. Some birds solved the puzzle in under two minutes on their very first try.

Crows Never Forget a Face

In a study at the University of Washington, researchers wore a rubber caveman mask while trapping and banding wild crows, then released them. Even years later - and without the mask on - those same crows scolded the researcher on sight, while ignoring people wearing a different mask. The crows had also taught other crows, including ones that were never trapped, to recognize and scold the 'dangerous' face. Researchers have observed this face memory lasting for more than a decade.

Field Naturalist Tip

Next time you see crows gathering and cawing loudly at one bird or animal, you're watching 'mobbing' - crows warning each other about a threat, sometimes passing that warning down for generations.

Match each corvid behavior to what it shows scientists

Terms

Bending wire into a hook

Dropping stones into a water tube

Scolding a researcher's mask years later

Groups of crows mobbing a threat

Definitions

Corvids share warnings socially within and across generations

Corvids understand cause and effect well enough to solve the Aesop's Fable problem

Corvids form long-term memories of specific human faces

Corvids can invent and shape new tools, not just use found objects

Drag terms onto their definitions, or click a term then click a definition to match.

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What did the Aesop's Fable water test reveal about crows and ravens?

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In the University of Washington mask study, what happened even years after crows were trapped while a researcher wore a caveman mask?

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Design a Crow Puzzle Box

Using a small box, string, and a treat (real or drawn), design a puzzle a crow would have to solve to get the reward - for example, pulling a string to bring a platform closer, or moving an obstacle out of the way. Draw or build your design, then write 3-4 sentences explaining what skill (tool use, cause-and-effect, patience) a crow would need to solve it.

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