In “Subspeciation in the Meadow Mouse, Microtus montanus, in Wyoming and Colorado,” Sydney Anderson meticulously explores the complex patterns of genetic and ecological differentiation within populations of the meadow mouse. This scholarly work delves into the nuances of subspecies identification and adaptation to the distinct habitats across these western states. Utilizing a combination of field studies and genetic analysis, Anderson presents a compelling narrative that situates the meadow mouse within a broader discourse on biodiversity and speciation, making significant contributions to the fields of mammalogy and conservation biology. Sydney Anderson is a distinguished biologist with a rich background in evolutionary studies. His extensive fieldwork in the rugged terrains of Wyoming and Colorado has equipped him with unique insights into the behavior and ecology of small mammal populations. Anderson's academic journey, marked by collaborations with leading ecologists, fosters a deep understanding of the environmental challenges facing these creatures, which likely motivated his exploration of subspeciation dynamics in Microtus montanus. This book is a crucial resource for ecologists, conservationists, and anyone intrigued by the intricacies of mammalian diversity. Anderson's thorough investigation not only enhances our comprehension of the meadow mouse but also emphasizes the importance of preserving ecological integrity in the face of habitat alteration. Readers will find themselves captivated by the interplay of science and conservation in Anderson's work.