List of endangered birds
In December 2019, the International Union for Conservation of Nature (IUCN) listed 460 endangered avian species. Of all evaluated avian species, 4% are listed as endangered. No subpopulations of birds have been evaluated by the IUCN. For a species to be considered endangered by the IUCN it must meet certain quantitative criteria which are designed to classify taxa facing "a very high risk of extinction". An even higher risk is faced by critically endangered species, which meet the quantitative criteria for endangered species.