Instruct: Classify Amazon reviews into positive or negative sentiment
Query: An extensively informative and visually impressive guide

Written by a cetacean biologist Robin W. Baird (who was also part of the team involved with the successful release program for the killer whale "Keiko" in Iceland), Killer Whales Of The World: Natural History And Conservation is an extensively informative and visually impressive guide to the life and habits of these amazing animals, wonderfully illustrated with full-color photography. Individual chapters address killer whale family life, on-going research, conservation efforts, human interactions and more. A captivating account of these amazing mammals, Killer Whales Of The World is very highly recommended reading for marine wildlife enthusiasts.