In the 2009 State of Bird Report, the government's first comprehensive study on the bird population in the United States, the alarming news is that nearly one third of the known species are endangered or in decline. Of the more than 800+ species, 251 made the list.
Habitat loss is the number one threat to birds. Sixty-seven million birds succumb to pesticide exposure each year. The positive news is that habitat restoration and conservation can reverse the decline of certain species.
According to Secretary of the Interior Ken Salazar: "From shorebirds in New England to warblers in Michigan to songbirds in Hawaii, we are seeing disturbing downward population trends that should set off environmental alarm bells."
Wetland species such as pelicans, herons, egrets, osprey and ducks have responded to conservation efforts. The report calls for more intense efforts with other species.
The study combined the work of the US Fish and Wildlife Service and the North American Bird Conservation Initiative, which includes partners from American Bird Conservancy, The Association of Fish and Wildlife Agencies, Cornell Lab of Ornithology, Klamath Bird Observatory, National Audubon Society, The Nature Conservancy and the US Geological Survey.
For more information, check out http://www.newenglandbirdhouse.com/. From there you can download a pdf of the report.