Just slightly smaller than 8.5 x 11 inch letter size with 500 pages and an inflexible, non-weather resistant cover, this book is too big and rigid to fit in anything other than a back-pack. It's not a quick reference field guide than you can quickly pop out of your coat pocket, and you'll ruin it if it gets caught in an otherwise lovely tropical drizzle. Additionally the way the book is organized does not facilitate quick on-the-fly identifications, the very kind that you most frequently need in the field. For instance, the first 200 plus pages contain color plates of the birds (86 full page plates in total, each containing between 1 and 15 species). If you open the book flat you're looking at the color plate on the right page and a numbered list of the birds on the left giving common name, biological name, size in centimeters and inches and a page reference number. It's this last point - page reference number - where A GUIDE TO THE BIRDS OF THE WEST INDIES really shows up its weakness in the field. The range and distribution maps, distinguishing characteristics, flight, voice, habitat and nesting information; basically all the data you'll need to pin down a firm sighting, are all on a different page than the birds picture. This information comprises the second half of the book.
Birders will have the same problem with this book as we do with all those guides that present illustrations and/or photographs of the bird on one page and it's range map and other vital information somewhere else. A typical example. The bird takes to the air. From the glimpse we get we know it's a hummingbird with green back and white underparts. The most likely candidate we come up with is a female Streamertail. Fine, except that once we flip to the back and read about range we realize the Streamertail in endemic to Jamaica and we're still in Puerto Rico; I guess it did look more like a female Antillean Mango afterall! It's worse with warblers, flycatchers, and especially vireos. There is much flipping back and forth between pictures and descriptions, particularly so for novice birders who may not be familiar with endemics and the very limited ranges that are major factors to be aware of when dealing with bird species in islands.
This book is very colorful and informative and very up to date. It's just not very well laid out for work in the field. I wish I could be more helpful by recommending another book but unfortunately there are issues with most of the regional guides. Rather than a West Indian guide you may want to use island specific ones (some available locally) for your field trips and leave this one in the hotel for detailed reference later.