This work investigates the ecological impact of introduced animal species on the Australian landscape and the subsequent disruption of native habitats. Eric Charles Rolls, a noted historian and naturalist, utilizes extensive field observations and historical records to document how species such as rabbits, foxes, and feral pigs have fundamentally altered the continent's biological equilibrium. The text argues that the introduction of these non-native animals represents a permanent shift in the Australian environment, necessitating a deeper understanding of human intervention in natural systems.

The text is regarded as a foundational study in Australian environmental history, noted for its meticulous documentation of ecological change. Its dense, observational approach provides a comprehensive resource for readers interested in the intersection of human history and natural science.