Livyatan melvillei was a giant prehistoric sperm whale that lived millions of years ago off the coast of what is now Peru, and it was named after Herman Melville, the author of Moby-Dick. Online, the name has become shorthand for an enormous, ancient sea predator, so short clips using it are shared by paleontology fans, creature-feature editors and meme makers who want instant scale. Its appeal endures because the name alone suggests something huge, old and dangerous, even for viewers who have never heard of the animal itself.