extincti extinction. we ve reported in the last 50 years the bird population has plummeted. bill wier here to explain. not good. the birds try to tell us things, right? in their movements, where they nest. and right now the autobonn society, one of the oldest conservation groups is declaring a bird emergency. from the baltimore or ideal iole golden eagle. from the song birds in your back yards, to the heron fishing in tampa bay. our fine fet every day friends are in deep trouble. at this site, there used to be 50 to 60 nesting piers. th this was 15 years ago. now we re down to five or eight piers. reporter: autobonn scientists took the latest climate mod ems and looked into the future of