Starting with their skeletons and evolution Thorington and Ferrell present a fairly comprehensive introduction to the Family Sciuridae, including the number and distribution of squirrel throughout the world and some interesting and fascinating facts about them. For instance, there are many more species in tropical Africa than in the South American rain forests, because squirrels, like humans are, relatively speaking, recent arrivals to the new world. The book also covers the topics of food, reproduction, genetics, and interactions with humans (good and bad depending on your point of view), and even a bit about squirrels in literature. A comprehensive list of squirrel species and a scientific bibliography complete the book.