This work serves as a foundational identification and biological guide to the unique herpetofauna of New Zealand, addressing the need for accessible information on native and introduced species. Joan Robb, a respected zoologist, synthesizes her field research and taxonomic expertise to provide a comprehensive overview of the islands' amphibians and reptiles. The text utilizes a structured biological framework to categorize species while providing historical context on their origins and ecological roles within the New Zealand environment.

The subject matter points to a specialized, authoritative reference text that remains a staple for regional naturalists and students of herpetology. Its structured approach and inclusion of distribution data provide a clear, technical resource for understanding the specific biological diversity of New Zealand.