The most comprehensive, authoritative and up-to-date guide to whales, dolphins and porpoises. With more than 500 accurate and detailed illustrations - complete with annotations pointing out the most significant field marks - this practical and portable guide to cetaceans covers all 93 species and every subspecies in the world. Informative text is accompanied by up-to-date distribution maps. An indispensable resource that every whale-watcher will want to take to sea.