Cities are renowned as hot spots of human diversity. This book demonstrates that although less well known, this is equally true of biodiversity. Here this is viewed through the unusual lens of reproductive diversity–the variety of means by which organisms perpetuate their lineages. It is a volume filled with insight and lots of natural history nuggets, and it is beautifully illustrated. I imagine that most readers will find 'I didn't know that' moments throughout.–Kevin J. Gaston, University of Exeter