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Primates

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Having logged thousands of hours observing chimpanzees and other apes, Frans de Waal (left, at his Atlanta field station) argues that primates, including humans and bonobos, are more cooperative and less ruthless than once thought.

Rethinking Primate Aggression

Researcher Frans de Waal shows that apes (and humans) get along better than we thought
August 2003 | By Richard Conniff

When one of the National Zoo's gorillas goes in for tests, it's not just standard operating-room procedure

By discovering heart disease early, echocardiograms have improved life for many a human; now Washington cardiologists are using them to help great apes at the National Zoo
January 1997 | By Michael Kernan


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