Thirthy-three common U.S. birds have lost more than half their global population over the past four decades

A team of scientists from the North American Bird Conservation Initiative (NABCI) identified the 33 U.S. common bird species in steep decline: Northern Pintail (Anas acuta), American Wigeon (Anas americana), Cinnamon Teal (Anas cyanoptera), Greater Scaup (Aythya marila), Long-tailed Duck (Clangula hyemalis), Scaled Quail (Callipepla squamata), Northern Bobwhite (Colinus virginianus), Purple Gallinule (Porphyrio martinicus), Franklin’s Gull (Leucophaeus pipixcan), Herring Gull (Larus argentatus), Black Tern (Chlidonias niger), Yellow-billed Cuckoo (Coccyzus americanus) , Snowy Owl (Bubo scandiacus), Short-eared Owl (Asio flammeus), Common Nighthawk (Chordeiles minor), Chimney Swift (Chaetura pelagica), Loggerhead Shrike (Lanius ludovicianus), Horned Lark (Eremophila alpestris), Bank Swallow (Riparia riparia), Verdin (Auriparus flaviceps), Varied Thrush (Ixoreus naevius), Snow Bunting (Plectrophenax nivalis), Cape May Warbler (Setophaga tigrina), Blackpoll Warbler (Setophaga striata), Wilson’s Warbler (Cardellina pusilla), Field Sparrow (Spizella pusilla), Lark Bunting (Calamospiza melanocorys), Grasshopper Sparrow (Ammodramus savannarum), Eastern Meadowlark (Sturnella magna), Rusty Blackbird (Euphagus carolinus), Brewer’s Blackbird (Euphagus cyanocephalus), Common Grackle (Quiscalus quiscula) and Pine Siskin (Spinus pinus). These are common birds that do not meet Watch List criteria, yet according to long-term monitoring surveys are rapidly declining throughout their range. They have lost more than half their global population over the past four decades.

Source:
The State of the Birds 2014
United States of America
http://www.stateofthebirds.org/habitats/2014%20SotB%20CBinSD_FINAL.pdf