This fold-out guide depicts all 50 species of extant (living) marine mammals known from the eastern North Pacific Ocean bounded by the International Dateline and the west coast of North America, the Equator and the south coast of Alaska. This concise and comprehensive waterproof guide helps with onsite identification, and is an excellent classroom tool. It also includes guidelines for watching marine mammals, habitat information, biology and diversity, and an illustrated glossary to habits and behaviours. Illustrated by Pieter Folkens.