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chimpanzees

New research confirms that wild chimpanzee mothers play a key role in the "home schooling" of their offspring, including lessons on the use of specialized tools to fish for a meal in the termite hills of Nouabalé-Ndoki National Park. Courtesy of Michael Nichols hide caption

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Courtesy of Michael Nichols

A juvenile chimpanzee uses a leaf sponge to drink palm wine in Bossou, Guinea. Gaku Ohashi/Chubu University, Japan, and Wildlife Research Center, Kyoto University, Japan hide caption

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Gaku Ohashi/Chubu University, Japan, and Wildlife Research Center, Kyoto University, Japan

Should chimps have the same legal rights as these lawyers? Steven Wise, president of the Nonhuman Rights Foundation, who is representing research chimps Hercules and Leo, says yes. Assistant Attorney General Christopher Coulston disagrees. They both made their arguments Wednesday in Manhattan State Supreme Court in New York. Richard Drew/AP hide caption

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Richard Drew/AP

Star enjoys a moment in the sun at the Chimp Haven sanctuary in Keithville, La. Brandon Wade/AP Images for The Humane Society of the United States and Chimp Haven hide caption

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Brandon Wade/AP Images for The Humane Society of the United States and Chimp Haven

Humans and chimpanzees — like this individual at a zoo in Australia — are animals who have evolved to forge extensive and elaborate social connections. Lisa Maree Williams/Getty Images hide caption

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Lisa Maree Williams/Getty Images

Chimpanzee Toni celebrated his 50th birthday at the Hellabrunn Zoo in Munich on Nov. 22, 2011. Sven Hoppe/DPA/Landov hide caption

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Sven Hoppe/DPA/Landov

Two chimps groom each other at the Save the Chimps facility in Florida. The National Institutes of Health owns about 360 chimpanzees that aren't yet retired and that are living at research facilities; new guidelines say most of its chimps should be retired. Save the Chimps hide caption

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Save the Chimps