HEN ORNITHOLOGIST Francisco Sornoza visited Ecuador’s Cerro de Arcos in April 2017, he was hoping to find interesting birds but had no idea he would discover a new species. He had made the 15-hour drive from Quito to this windswept Andes mountain region, named for its rocky arches, to help El Oro provincial government assess the area’s potential for attracting ecotourism. After hiking for three hours, Sornoza—Pancho to his friends—and companions stopped to rest on a high, flat rocky expanse. As they chatted, a small white streak boldly
