Orca, Paperback/III Herzog, Arthur

Orca --the killer whale--is one of the most intelligent creatures in the universe. He hunts in packs, like a wolf. Incredibly, he is the only animal other than man who kills for revenge. He has one mate, and if she is harmed by man, he will hunt down that person with a relentless, terrible vengeance--across seas, across time, across all obstacles.