liotier @liotier CC BY-SA 25/07/2014 #Mayfly hatch in #Mississippi River, so massive that the swarm showed up on the radar http://i.imgur.com/XYnTgZd.gif http://i.imgur.com/kKU2QVz.jpg http://i.imgur.com/CSHUwQz.jpg #insects #Mississippi river #Mississippi liotier @liotier CC BY-SA