The large and impressive monitor lizard (genus Varanus) has attracted a great deal of interest. Despite being wary and difficult to observe, monitors have received an extraordinary amount of attention from devoted students. Varanoid Lizards of the World is a comprehensive account of virtually everything important that is known about monitor lizards, beginning with detailed species accounts and proceeding to various modern comparative analyses. Where possible, people who have had detailed field experience with a particular species have assembled the species accounts. In the process of reporting what is known, the book also identifies what remains to be learned about these lizards. This volume stands as a model for showing how such a diverse monophyletic group can be exploited both to identify and to understand the actual course of evolution.