This volume serves as a comprehensive reference guide to the game reserves and wildlife sanctuaries located within Kenya, Uganda, and Tanzania. The author, John G. Williams, utilizes his extensive knowledge of East African ecology to catalog the region's biodiversity, providing a structured framework for identifying the principal mammal and bird species found in each protected area. The text integrates geographical data with biological descriptions to assist travelers and naturalists in navigating the diverse habitats of the region.

The subject matter points to a specialized, historical reference text intended for field naturalists and travelers interested in mid-20th-century East African conservation. The inclusion of detailed illustrations and systematic species lists suggests a high level of utility for those conducting biological surveys or wildlife observation in the region.