Humpback whales engage in tactics: "...A male swimmer has just whipped the whole muscular, tapering rear of its body—the peduncle, which powers the fluke—high in the air. It causes the animal's front end to swing straight downward, forcing a male that had been hot on its tail to dive to avoid a collision."
I had other tiny bubbles, but I've lost 'em. These'll do. :)
miles to Dunharrow: 26