Sometimes called the most colourful creatures on earth, nudibranchs are a type of shell-less marine snail that capture the attention of scuba divers, snorkelers and tidepool-gazers with their bizarre, ornate body forms and incandescent colouration. There are over 3,000 species worldwide and some of the most spectacular specimens are native to the temperate waters of the Pacific Northwest. A diver of many years' experience, Rick Harbo presents a brilliant guide to the most notable specimens found in local waters. This durable, water-resistant 8-fold pamphlet identifies more than 50 of the most common species from California to Alaska and is an ideal companion on visits to the sea as well as a beautiful addition to the home library.