The demography of extinction in eastern North American birds

The demography of extinction in eastern North American birds

Analysis: 'Horrific' bird losses touch every state, surprise experts

Extinct Species Wildlife Journal Junior

Fragile life: how birds go extinct - Geographical

North America has lost 3 billion birds since 1970

7 birds you won't believe are threatened with extinction - BirdLife International

Carolina parakeet - Wikipedia

Extinct Species in Audubon's Birds of America

North American birds face risk of extinction, report says

On The Brink: The Five Rarest Birds of the United States

List of extinct bird species since 1500 - Wikipedia

Vanishing: More Than 1 in 4 Birds Has Disappeared in the Last 50 Years

Extinct North American Species - NatureWorks