U.S. bird populations are experiencing alarming declines due to factors such as habitat loss and climate change, according to a new report identifying 112 species that have reached a "tipping point," including 42 with perilously low numbers and steep downward trends.

Sea ducks such as Common eiders, grassland birds such as Western meadowlarks and Lark buntings, and forest species such as Pinyon jays in the West and Bachman's sparrow in the East are among a wide variety of bird species that are in serious declines,

State of the Birds report identifies 112 "tipping point" species — those that have lost more than half their populations in the past five decades.

The U.S. bird population is declining at an alarming rate, according to a report published Thursday by an alliance of science and conservation groups. Habitat loss and climate change are among the key contributing factors to the bird population losses,