Book excerpt: Practical and portable, this is the ultimate field guide to the world's cetaceans. This outstanding new field guide to whales, dolphins and porpoises is the most comprehensive, authoritative and up-to-date guide to these popular mammals. With more than 500 accurate illustrations – complete with detailed annotations pointing out the most significant field marks – Field Guide to Whales, Dolphins and Porpoises covers all 93 species and every subspecies in the world. Many of the world's most respected whale biologists have collaborated on the concise text, which is packed with helpful identification tips from cetacean expert, Mark Carwardine. Mark's informative text is accompanied by up-to-date distribution maps for each species. Beautifully designed, to ensure critical information is quickly accessible, this is an indispensable resource that every whale-watcher will want to carry out to sea.