An illustrated guide to finding and sorting out similar species of birds in the mountains, deserts and other habitats of the West. Zimmer provides plenty of useful information on individual species, including behavior, habitat and identification. Useful as a site guide, he includes detailed listings by state -- and suggestions of the best places to find individual species. With numerous black-and-white illustrations and photographs of similar species and sought-after birds.  (USW404, $29.95)