This book presents the results of more than 25 years of research on killer whales in Washington State and British Columbia. Intended for both whale watchers and researchers, this updated edition of the book first published in 1996 contains the latest information about killer whale natural history. It includes over 300 photographs of resident killer whales as well as a genealogical registry that enables readers to identify individual killer whales and their family groups. A special section includes suggestions for whale watchers.