Bye, Bye Birdies?

20 Common Bird Species Are In Dramatic Decline, According To Audubon Study New data show the populations of some of America's well-known birds in a tailspin, thanks to the one-two punch of habitat fragmentation and, increasingly, global warming. From the heartland's whippoorwills and meadowlarks to the Northern bobwhite and common terns of the nation's coasts, 20 common bird species tracked by the National Audubon Society have seen their numbers fall 54 percent overall since 1967, with some down about 80 percent, the group reported.