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Jane Goodall's fondest memory is what happened when chimp David Greybeard went missing. She describes his response when she found him, and gives a rendition of her personal 'pant hoot' - the call that one chimp gives another. Image: Jane Goodall as a young researcher with baby chimpanzee Flint at Gombe Stream Reasearch Center in Tanzania. Credit: the Jane Goodall Institute / by Hugo Van Lawick