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List of critically endangered birds - Wikipedia
More Critically Endangered birds on IUCN Red List
7 of the World’s Most Endangered Bird Species | Earth.Org
18 of the world’s most endangered birds - IFAW
The Red List - BirdLife International
IUCN Red List of Threatened Species
List of endangered birds - Wikipedia
Data Zone - BirdLife International
Birds - BirdLife International
Preventing Extinctions: bringing the world’s most threatened birds …