The topics discussed in this volume have been chosen to represent studies in which both behavioural and neurobiological analysis have been emphasized. They include work on behavioural and neural aspects of imprinting, song learning in birds, and spatial memory of food-storing birds. There are also overviews of neural and behavioural aspects of classical conditioning, the role of the hippocampus in spatial behaviour in mammals, and studies of learning in invertebrate model systems. Each contribution has been written by a leading international authority and gives an up-to-date and concise account of current developments. The volume is based on a Royal Society Discussion Meeting held in February 1990 and the papers are being published in the Society's Philosophical Transactions Series B.