The Atlantic: Scientists Have Found Another Crow That Uses Tools

In 2013, Christian Rutz travelled to Hawaii, and presented two crows with a log containing several small holes. These had been baited with meat, but were too small and deep for the crows to reach with their beaks. “Within literally seconds, one of the birds came down, looked for a stick, began probing into the holes, and started extracting the food,” he says. The crow had been raised in captivity and had never done anything like this before. And yet, it was wielding the stick like a pro. “I could tell from its dexterity that it wasn’t just a fluke. It was one of those rare moments when you know you’ve made a big discovery.”

You might be thinking that scientists have long known that some crows are exceptional tool users. Let me assure you that, yes, Rutz knows about those crows. He has studied them for a decade in the Pacific island of New Caledonia where they live. He has seen them artfully use sticks to pry grubs from wood. He has seen them care for their tools and fashion new innovative implements. But as far as he knew, their prowess was unique. There are over 40 other species of crows and ravens, and none seem to use tools so readily or skillfully as the New Caledonian crow. [...]

Many animal species can be trained to use tools in captivity even when they don’t do so naturally. That includes the rook—the Hawaiian crow’s closest relative. It can quickly learn to probe holes with sticks (albeit clumsily), but despite decades of regular bird-watching, no one has ever seen a wild rook use a stick tool.

The same could be said of Hawaiian crows, but Rutz says, “I truly believe that in the past, these birds would have used tools in the wild.” The captive adults all did so spontaneously and exactingly. Rutz even tested seven recently hatched chicks, which had never used sticks before and had no chances to observe tool-proficient adults. Their human keepers had been briefed to never use tools in front of them. [...]

Narcissists that we are, we humans like to associate tool use with great intelligence. But the crows tell us that tool use might be a precarious skill, which might only emerge under the right combination of ecological privilege and fortuitous physique.

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