For the second time in as many days, a new report highlights trouble for American birds. While a study by the National Audubon Society points out threats from future climate change, a new multi-agency report says that many U.S. birds are already in decline. (See "Climate Change May Put Half of North American Birds at Risk of Extinction.")

The current state of birds in the U.S. is a mixed bag, according to a report released Tuesday morning by the North American Bird Conservation Initiative U.S. Committee. Some species, like the bald eagle, have recovered enough to be taken off the U.S. list of endangered species. Others, like all 33 native Hawaiian bird species, are either endangered or