Review of the hardback: 'This is a stimulating book. You will find (i) essays of straightforward data whose relation to the larger issues raised seems unclear, (ii) ideas that stimulate your own 'imagination', (iii) detailed statements by some of the better known human researchers of chimpanzees and gorillas, and (iv) how the clever methodologies used to study human children can be appropriated for work with non-human primates.' Ethology