Robert Havell after John James Audubon/U.S. Fish and Wildlife ServiceThe U.S. Fish and Wildlife Service said Monday that it is delisting 21 species from the Endangered Species Act because they’re now extinct. The species were part of a list of 23 proposed for delisting two years ago. The service said it would “continue to analyze and review” information about the ivory-billed woodpecker, and the delisting proposal for a Hawaiian perennial herb species has been withdrawn completely. The other 21