List of contributors; Foreword Howard E. Gruber; Preface; Acknowledgements; 1. Theoretical frameworks for comparative developmental studies Sue Taylor Parker, Bernard Baars and Kathleen Rita Gibson; 2. Comparative developmental perspectives on Cebus intelligence Francesco Antinucci, Dorothy Munkenbeck Fragaszy, Kathleen Rita Gibson, Sue Taylor Parker and Patricia Poti; 3. Questions regarding imitation, language and cultural transmission in apes and monkeys Elisabetta Visalberghi, Dorothy Munkenbeck Fragaszy, Michael Tomasello and Jacques Vauclair; 4. Developmental perspectives on social intelligence and communication in great apes Juan Carlos Gomez, Kim A. Bard, Anne E. Russon and Ben G. Blount; 5. Development of numerical and classificatory abilities in chimpanzees and other vertebrates Sarah T. Boysen, Gary G. Barntson, Tetsuro Matsuzawa and Irene Maxine Pepperberg; 6. Comparative developmental perspectives on ape 'language' H. Lyn White Miles, Patricia Marks Greenfield and E. Sue Savage-Rumbaugh; Index.