Killer Whales of the World: Natural History and Conservation (Worldlife Discovery Guides) by Robin W. Baird
This book distills hundreds of scientific studies into a reader-friendly text accessible by both children and adults. Chapters on foraging and feeding, behavior, and sounds and senses explore the basic biology of killer whales. Recommended for all libraries, essential in the Pacific Northwest.

• Listening to Whales: What the Orcas Have Taught Us; Alexandra Morton
  This book was listed as an Honorable Mention in the 2002 National Outdoor Book Awards. From the award citation: "Alexandra Morton makes a strong case for the orca's continued life on earth. She does this so remarkably well and in such an engaging style that you'll find yourself quickly drawn into the story of her life and research work with whales."
• Killer Whales: The Natural History and Genealogy of Orcinus Orca in British Columbia and Washington State; John Ford, Graeme Ellis, and Kenneth Balcomb
  The authors have been studying killer whales since the early 1970s. They present the latest information on killer whale natural history and suggestions on how, when, and where to best watch killer whales.
• Orca: Visions of the Killer Whale; Peter Knudtson
  From a discussion of orca evolution to an examination of their anatomical, physiological, and behavioral development, this book combines cultural and historical perspectives with biological facts. It discusses tribal identification with the orca, compares the intelligent whale to landlocked humans and wolves, and describes its hunting, mating, and communication talents. Includes 55 full-color photos.
• Namu, the Killer Whale (VHS)

• The Whale-Watcher's Handbook: A Field Guide to the Whales, Dolphins, and Porpoises of North America by David K. Bulloch
• Going Wild in Washington and Oregon: A Guide to Northwest Wildlife Viewing by Susan Ewing
• Washington Nature Weekends by Patricia Sunny Walter, Janet O'Mara
• Watching Wildlife (Watchable Wildlife Series) by Mark Damian Duda
• Photographing Animals in the Wild: Photographic Hints and Tips by Andy Rouse