A series of devastating tornados occurred in southern United States in April of 2014.  The torrent of tornadoes killed 35 people and caused billions of dollars of damage. Animals were also affected. The one species of animal that was untouched were the Warblers.(a kind of bird). Amazingly, they left their breeding grounds two days before each tornado. Henry Strevy, a ornithologist, attached a half gram tracking device on 20 of the tiny birds.