Evolving in an environment that was either being flooded or burned has made Florida grasshopper sparrows incredibly resilient. But with over 90 percent of their habitat gone, the race is on to preserve the U.S.'s most endangered songbirds. Discover more about this species in The Little Brown Bird, now available on Nat Geo's YouTube channel. Learn more about the efforts to save them and their home: https://on.natgeo.com/4l6C8rU