The Most Bizarre and Unexplainable Things to Ever Drift Ashore

In 2014, beachgoers on the western coast of the United States were confronted by millions of squishy blue animals resembling jellyfish, but each was topped with a rigid structure resembling a sail. Each of these tiny organisms, called “by-the-wind sailors,” measures about 2.75 inches (7 centimeters) in length. They typically inhabit the open ocean, preferring warm waters in locations around the world. But every few years, storm activity can sweep them toward coastal regions, where they pile up on beaches in enormous quantities.