Twenty-four birds species are considered to be "lost" in the Western Hemisphere. These birds (listed below) are considered Critically Endangered by IUCN—not extinct—but have no known surviving wild or captive populations. ABC is working to find some of these species through the Search for Lost Birds initiative.

Lost Birds of the Americas

Caribbean, Mexico, and United States:
Semper's Warbler
Jamaican Pauraque
Ivory-billed Woodpecker
Cozumel Thrasher
Imperial Woodpecker
Guadalupe Storm-Petrel
Bachman's Warbler
Eskimo Curlew
Nukupuu
Oahu Alauahio
Olomoa
Ou
Poo-uli

Brazil:
Belem Curassow
Cryptic Treehunter
Pernambuco Pygmy-Owl
Glaucous Macaw
Rio de Janeiro Antwren
Kinglet Calyptura
Alagoas Foliage-Gleaner

Andes:
Táchira Antpitta
Turquoise-throated Puffleg
Antioquia Brush-Finch
Bogota Sunangel