Western Mexico is home to a remarkable diversity of terrestrial life shaped by tropical dry forests, seasonal river valleys and coastal lowlands. This bilingual field guide documents 230 species of amphibians, reptiles, birds and mammals found across the region’s Pacific slope.

Featuring 440 full-color photographs taken by the author in the field, the guide is designed as a practical identification tool for naturalists, students and travelers seeking a deeper understanding of the region’s biodiversity. Each species account combines concise descriptive information with clear photographic reference, allowing for confident recognition in real-world conditions.

Rather than presenting wildlife as isolated subjects, the book reflects years of direct field observation across varied habitats — from mangrove estuaries and thorn forests to mountain foothills. The result is both an accessible introduction for newcomers and a reliable companion for experienced observers.

Published in a bilingual English–Spanish format, the guide serves local readers and international visitors alike, encouraging closer engagement with Western Mexico’s terrestrial ecosystems.