Stokes Field Guide to Bird Songs Western Region covers 551 species. The informative 64-page booklets give precise call and song descriptions of all species covered, plus helpful hints on distinguishing sounds of similar species. As a special bonus, one MP3 CD is included, containing all the bird sound files with voice narration removed for use on your MP3 device. Informative pdf booklet gives precise call and song descriptions. Includes 5 CDs; approximately 5 hours.