One of the most obvious changes that has occurred in behavioural biology in recent years is that it has become conspicuously a problem orientated subject. Moreover, one of the most impor­ tant consequences of this has been to stimulate interdisciplinary links between evolutionary biology, zoology, ecology, anthro­ pology and psychology. The time is now right to ask questions which relate whole animals in the contexts of their ecosystems, with their social behaviour and development, with their perceptual and cog­ nitive capacities. These are new ways of looking at old problems, but we are still at the stage of finding out what kinds of questions to ask. For several years now I have been involved in teaching behavioural biology to students of psychology as well as zoology, and have greatly appreciated the opportunity to relate material across many different subject areas. It is the interfacing of prob­ lems, as in ecology and psychology for example, that makes 'more sense' of topics such as 'intelligence', responses to 'novelty', feeding strategies and socialleaming. The aim of the book is to provide readily digestible information in a number of areas of current interest in behavioural biology. Above all, it is intended to provide a basis for discussion and further inquiry.