Rocky spent his first few years raised by people, and is particularly attuned to human speech and behavior, researchers say. But his remarkable ability to learn and match human pitch and common sounds of speech surprised them. Mark Kaser/Courtesy of Indianapolis Zoo hide caption

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Mark Kaser/Courtesy of Indianapolis Zoo

Orangutan's Vocal Feats Hint At Deeper Roots of Human Speech

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A baby orangutan wearing a diaper swings through the trees at the Sumatran Orangutan Conservation Program outside Medan, capital of Indonesia's North Sumatra province. The program takes mostly orphaned orangutans, nurses them back to health and releases them back into the wild. Anthony Kuhn/NPR hide caption

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Anthony Kuhn/NPR

As Palm Oil Farms Expand, It's A Race To Save Indonesia's Orangutans

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Tilda the orangutan, relaxing between gabfests at the Cologne Zoo. Cologne Zoo hide caption

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Cologne Zoo

From The Mouths Of Apes, Babble Hints At Origins of Human Speech

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