Actually, killer whales get the name “killer” on account of what they do to their whale cousins. See The Last Vikings, if you can find it. I read it. It was a book about the decline of the viking way of life, and it has an account of a “grampus” whale chasing after a much larger, but terrified, whale and taking big chunks out of him. But AI has no record of it, and I don’t recall the author’s name.
The Last of the Vikings by John Bojer!
Another interesting bit of history, at least I’ve seen it claimed to be true, is that Moby Dick is loosely based on an actual whale that terrorized whaling fleets across the Pacific. I think it was mottled white in a color, and totally pissed off at whalers. Its reign of terror went on for several decades and it never lost a fight.