Identifying a bird is just a tap away with the Peterson Field Guide to Birds of Massachusetts. Peterson's art, conveying each bird's essence, and the innovative Peterson Identification System, are all at the casual bird watcher's disposal. 439 species are in this visual treasure chest. Arrows point to the key field marks that distinguish each species, and range maps tell users where and when to find the birds. Add in descriptions of habitats, vocalizations, similar species, and an easy-to-use index, and a bird watcher is fully prepared to enjoy the natural wonders of Massachusetts.