Over the past few weeks, various species of migratory birds are dying in “unprecedented” numbers of unknown causes. And this growing number of birds in southern New Mexico that have mysteriously died have wildlife experts scratching their heads. “It is terribly frightening,” Desmond said. “We’ve never seen anything like this. … We’re losing probably hundreds of thousands, if not millions, of migratory birds.“ In August, large numbers of birds were found dead at White Sands Missile Range and at the White Sands National Monument in what was thought to be an isolated incident, Desmond said. After that, however, came reports...