Primatologist Jane Goodall

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Goodall likes to recount the story of a man she knew, Marc Cusano, the caretaker of five chimpanzees at a Florida zoo, who slipped and fell, frightening an infant who then screamed. "At once the mother and the other females attacked Marc," she recalls. "He thought he'd had it, but [an elder male] charged up, seized the females and hurled them away, one by one. He saved Marc's life. If a chimpanzee can reach across the species gap to help save a human in time of need, surely we can reach out and help the chimpanzees? Surely we must speak out for them — for they cannot speak for themselves."