For centuries, we told ourselves that we are special — that what separates humans from animals is our ability to reason.
But that belief has been increasingly undermined given evidence showing apes also have the intelligence to use tools, solve complex problems and even plan for the future.
Now the latest indignity: Ravens can do it, too.
On a rural research farm in Sweden, working with birds he raised from hatchlings, cognitive zoologist Mathias Osvath recently taught five ravens how to use…
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