http://thinkprogress.org/climate/2016/05/19/3779611/state-of-north-america-birds-report/
"Thanks to a multitude of threats, over a third of the bird species in North America are “of major conservation concern,” according to a comprehensive study released Wednesday. The report, released by the governments of Canada, the United States, and Mexico, is the first to look at the threats facing all 1,154 migratory bird species native to North America."
