It calls up the wind. Boats shouldn't be named after an engaged woman because the seas get jealous. Don't paint a boat blue. Don't set sail on a Thursday. Never harm a bird at sea.
Birds bring good luck.
Taking an umbrella aboard a ship is unlucky. Build a Beast Old-time sailors invented stories of sea monsters out of fear and superstition. Create your own sea monster with playdough. Use buttons, pipe cleaners, toothpicks, paperclips, or Q-tips to give your sea monster claws and teeth, just as the sailors did. After you make your creature, name it.