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Clever New Caledonian crows use one tool to acquire another

The New Caledonian crow showcases extraordinary intelligence by using metatools to solve problems, a skill rare in the animal kingdom.

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You don't have to be particularly intelligent to use tools - many animals do so, including some insects. But it takes a uniquely intelligent animal to be able to combine different tools to solve a problem. We can do it, the great apes can do it, and now the New Caledonian crow joins our exclusive club.

Animals can use tools using little more than pre-programmed behaviour patterns that require little intelligence. But combining tools, or using one tool on another (a metatool, if you will), is a different matter entirely - that takes reasoning. This type of intelligence has been the engine of human innovation. It allowed us to use simple tools to make advanced ones, or to combine different tools into increasingly complex machines.

The majority of animals lack the ability to manipulate tools in this way and in primates, the line is drawn at the great apes - ...

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