Butterflies are particularly sensitive to climate and are important `bio-indicators' of climatic change. This unique and important book not only explores how butterflies adapt to climatic gradients and weather patterns; it shows how their biogeography and evolution have responded to climate change in the past, and how they are likely to respond in the future as the enhanced greenhouse effect increasingly alters the world's climate. This book is a major contribution not only to insect ecology, but also to our understanding of how anthropogenic climate change affects natural populations and ecosystems.