The Insects takes a detailed look at how insects function as animals. This textbook brings together basic anatomy and physiology and relates them to behavior. Coverage emphasizes the roles of different functional systems in the context of the whole organism using studies of many different species as examples. Unlike other texts, The Insects does not dwell on classification, opting instead to take an in-depth look at physiology, providing any biologist with a better basic understanding of how insects work. A long-awaited update of a well established standard text and respected reference work for students and researchers in zoology, entomology and physiology, this fourth edition has been rewritten throughout, while retaining the successful structure of the earlier editions. Illustrations have been augmented with electron micrographs, and expanded reference sections will make this volume a valuable addition to all biologists' bookshelves.