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    4. GREGOIRE

    Age: 66

    Location: Tchimpounga Chimpanzee Rehabilitation Center

    The Details: The day the world lost Gergoire in 2008, they also lost a conservation icon. The chimp was looked upon as a symbol against the human mistreatment of primates. For 40 years, Gregoire lived in a barren cage in an African zoo. He was eventually rescued and cared for by the Jane Goodall Institute for the rest of his years. (Discovery)