Two of the basic tenets of modern evolutionary biology are that, within an ecosystem, each species fulfills a critical role and that when a species is perturbed or an addition is made to an ecosystem, the ecological ramifications will often be noticed rippling throughout the entire community...Exploring and expanding on these nested relationships are two of the things that Gilbert Waldbauer does so well in his engaging natural history...Waldbauer takes some of the least appreciated species in most ecosystems--insects--and eloquently discusses many of the roles they play...His book is accessible to anyone interested in natural history...What Waldbauer does best is transmit his respect and admiration--perhaps awe is not too strong a word--for the insects he has spent his life studying.