Basics: 1989, revised edition, softcover, 254 pages, 24 color and 17 b&w plates, 284 species, no range maps
This is one of the few books to focus on the birds of Puerto Rico. Its field guide size makes the book convenient to carry and the illustrations are good enough to help identify nearly every bird that can be found on the island. The Puerto Rican endemics are nicely distinguished by having either a single color plate dedicated to the bird or by having a distinctive blue sphere surround the bird if it's on a plate with other species. Distinguishing the endemic is a very handy feature that should be used in other regional field guides. I would like to have seen more attention and illustrations given to the endemics, such as the Puerto Rican Vireo or the Puerto Rican Flycatcher. Each has only one image, which fails to show the variation that can exist in the fresh vs. worn plumages.
The text, making up the latter two-thirds of the book, covers the standard information of identification, voice, nesting (if applicable), distribution, and comments. The comments section often provides interesting historical, taxonomic, habitat, and behavioral tidbits. These are nice additions to a field guide.
Two nice features have been included into the back of the book. One, is a section of seven birding localities with a map, directions, and commentary on each. Two, is a checklist denoting which birds can be found at each of those localities.
I would like to see an update to this book to include range maps for this island. Yes, many of the birds might have very similar ranges, but others (e.g., Yellow-shouldered Blackbird, Puerto Rican Nightjar, Elfin Woods Warbler) have very restricted or spotty ranges.
Using only this book in Puerto Rico will be sufficient for any trip. However, my next trip will include the more up-to-date Birds of West Indies by Raffaele (paperback). The information is written a bit more clearly with additional characteristics; the drawings are moderately better; and, there are more illustrations for the endemics.
I've listed several related books below...
1) Puerto Rico's Birds in Photographs by Oberle
2) Las aves de Puerto Rico by Biaggi
3) Birds of the West Indies by Bond
4) Birds of the West Indies by Raffaele
5) A Guide to the Birds of the West Indies by Raffaele
6) Photographic Guide to Birds of the West Indies by Flieg