Beetles make up about a quarter of known animal species and are arguably the most diverse group of organisms on Earth: almost 400,000 species have been formally described so far, and it is likely that this number merely scratches the surface. In Beetles of the World, Maxwell Barclay and Patrice Bouchard--two of the world's foremost beetle experts--celebrate these remarkable creatures in all their variety, from their size and appearance to their ecological importance.