The CBC has a story about a brochure [stateofthebirds.org], The State of North America’s Birds 2016, issued by the North American Bird Conservation Initiative (NABCI). The brochure (not readily accessible to the blind) presents the results of
the first-ever conservation vulnerability assessment for all 1,154 native bird species that occur in Canada, the continental United States, and Mexico.
It states that 432 of those species, or 37%, "need urgent conservation action" whilst 49% warrant moderate concern and 14%, low concern. Species that inhabit the ocean and tropical forests had the greatest proportions "in crisis."