This book presents an overview of selected topics in comparative cognition, which is the study of behaviour and mental activities in nonhuman animals. Human psychological capacities are often used as a heuristic by comparative cognitive scientists, whose tasks include designing valid procedures for studying species¿ sensory, linguistic or manipulatory abilities that differ from those of humans. Nonetheless, researchers have developed many original ways to gain insights into how other species perceive the world, store and integrate information, and communicate. The contributors to this book have all been involved in such work, and will present some of the approaches that have led to clear advances in our