Other reviewers have already indicated the limitations of this book: pictures of many species and Spanish names are missing. I would add that the bibliography is lacking up-to-date references to the most usefull other guides about Mexican birds:
- A Guide to the Birds of Mexico and Northern Central America, by Steve N.G. Howell and Sophie Webb;
- A field guide to the birds of Mexico and Adjacent Areas, by Ernest Preston Edwards. (revised edition, 1998)
Both these books also have their limitations but they are essential complements to Peterson's guide and Howell and Webb's guide is much more comprehensive.
For Spanish-speaking people I would strongly recommend to buy the Spanish version of Peterson's guide:
- Aves de Mexico. Guía de Campo. (Editorial Diana, Mexico).
This Spanish version includes explanations and pictures of all Mexican birds and it even has the English names (no index of English names, however). Amazon is not stocking this title but perhaps they will, if you insist.