Trib: If bird watchers in Pennsylvania think they are seeing less of some species the ruffed grouse, scarlet tanager, wood thrush and Baltimore oriole they are right. Those birds could go the way of the once-prevalent Passenger Pigeon and are among hundreds at risk of disappearing, according to a report by the Audubon Society and another jointly prepared by the Fish & Wildlife Service and the Cornell University Lab of Ornithology. The projected declines, the studies each say, reflect climate changes...