“Imagine a forty-five-year-old male fifty feet long, a slim, shiny black animal cutting the surface of green ocean water at twenty knots. At fifty tons it is the largest carnivore on earth. Imagine a four-hundred-pound heart the size of a chest of drawers driving five gallons of blood at a stroke through its aorta; a meal of forty salmon moving slowly down twelve-hundred feet of intestine…the sperm whale’s brain is larger than the brain of any other creature that ever lived…With skin as sensitive as the inside of your wrist.”