Famous chimpanzees solved puzzles that changed how humans understood intelligence, but their move to Berlin had a tragic ending

More than a century ago, a small group of chimpanzees helped revolutionise the way scientists understood intelligence. Through a series of pioneering experiments on the Spanish island of Tenerife, these apes demonstrated that they could solve problems using insight rather than relying solely on trial and error - a discovery that challenged long-held assumptions about the uniqueness of human reasoning.

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