ACKNOWLEDGMENTS<br > I SHOULD HAVE BEEN UNABLE to study chimpanzees or wril<br > this book without the help and encouragement of a great man<br > people， and I should like to express， however inadequately， m<br > most profound thanks to all of them. First， of course， my grat<br > tude lies with Dr. L. S. B. Leakey. It was he who originally su~<br > gested that I should study chimpanzees， he who found money t<br >finance my early field work， and he who arranged for me to writ<br >up my results for a Ph.D. dissertation at Cambridge University<br >Last ~ but by no means least- it was through Leuis s recom<br >mendation that Hugo came to photograph the chimpanzees.<br > I am tremendously grateful to the Tanzania government， it<br >President， Mwalimu Julius Nyerere， and many of its officials fo:<br >pennittlng us to conduct our research in the Gombe Stream area<br >and for giving us at all times help ，and assistance. I was initiall)<br >helped by the Head and officials of the Tanzania Game Depart.<br >ment， and I am particularly grateful to David Anstey， who as-<br >sisted my mother and me when we first set up camp， and to the<br >African Game Scouts Adolf， Saulo David， and Marcel， who were<br >stationed in the Gombe Stream when the area was a game reserve.<br >More recently， since the Gombe became a national park， we have<br >received cooperation and assistance from Dr. John Owen， former<br >