The U.S. Fish and Wildlife Service has announced that 21 species once deemed “endangered” by the Endangered Species Act are now extinct. Officially, this process is called “delisting species due to extinction.” “Our determination of whether the best available information indicates that a species is extinct included an analysis of the following criterion: detectability of the species, adequacy of survey efforts and the time since last detection,” the agency said in a statement. The extinct species includes the Bachman’s warbler, an insect-eating songbird that called the swamps of the Carolinas its home. According to Noah Greenwald, endangered species director at the Center for Biological Diversity, “The bird had a ‘buzzy’ song, and the song added to the beauty of the bird, and when combined that added to the magic of North Carolina. We lost a little magic when we lost the species. And what’s really sad is that the Bachman’s warbler was abundant at the turn of the 20th century, but...