Chimpanzee Cultures: With a Foreword by Jane Goodall

A chimpanzee in one place smashes nuts to get the meat. Elsewhere his counterpart pays the same kind of nut no heed. The first chimp's mate is aggressive; the other's not at all. The first uses a certain kind of signal; the second, another. Why the difference? Are these adaptive behaviours, serving a particular need, or do chimpanzees have local traditions handed down through generations - something akin to culture?