From Birdlife
One tenth of bird species flying under the conservation radar
More than 350 newly recognised bird species have been assessed by BirdLife International for the first time on behalf of The IUCN Red List of Threatened Species™.

Source: naturalhistorywanderings.com

GR:  Perhaps the real surprise is that more aren’t threatened.  In my home state, wildlife biologists consider more than half of the 451 native species vulnerable or imperiled, many critically imperiled.