This report is based on the first-ever conservation vulnerability assessment for all 1,154 native bird species that occur in Canada, the continental United States, and Mexico. The assessment was compiled by a team of experts from all three countries. The overall conservation status for each species takes into account its population trend, population size, extent of breeding and nonbreeding ranges, and severity of threats to populations. The Watch List identifies species of highest conservation concern based on high vulnerability scores across multiple factors. Year-round abundance maps from eBird data, in which intensity of color reflects seasonal abundance, are presented for selected species.
Habitat types fell into one of four levels of concern based on the percentage of species they contain that are on the Watch List:
Many species in coastal, grassland, and aridland habitats are declining steeply. In particular, long-distance migratory shorebirds and species that migrate from the Great Plains to Mexico’s Chihuahuan grasslands have lost, on average, almost 70% of their continental populations since 1970.
Most species in these habitats are of moderate or low concern, yet roughly 20% are on the Watch List. Waterfowl have benefited from careful harvest management and wetland conservation, but positive waterfowl trends may not last if wetlands loss continues.
The generalist group—birds that are adaptable and can live in multiple habitats—are of lowest conservation concern.