Thousands of these marine worms, called fat innkeeper worms—or "penis fish"—washed up on Drake's Beach after a recent storm. https://t.co/MwY6xkN3kb pic.twitter.com/vGMpSvGoAT — Bay Nature magazine (@BayNature) December 11, 2019The mysterious sighting of ‘penis fish’ or fat innkeeper worms were discovered after a recent storm on Drakes Beach on Dec. 6, according to Bay Nature. The fat innkeeper worm, or Urechis caupo, is a type of spoon worm, identified by its spatula-shaped proboscis for feeding, grasping or swimming. U. caupo, the scientific name of the fat innkeeper worm, is only found in North America from Southern Oregon to Baja. How did thousands of ‘penis fish’ end up on Drakes Beach?