Books read:
Living on the Wind: Across the Hemisphere with Migratory Birds, Scott Weidensaul
Of a Feather: A Brief History of American Birding, Scott Weidensaul
John James Audubon: The Making of an American, Richard Rhodes
Dodo: A Brief History, Erroll Fuller
Extinct Birds, Erroll Fuller
The Song of the Dodo: Island Biogeography in An Age of Extinctions, David Quammen
Hope is the Thing with Feathers: A Personal Chronicle of Vanished Birds, Christopher Cokinos
Online Resources:
Wikipedia list of extinct birds
Index of Extinct Birds via the Dutch National Natural History Museum.
Why the Passenger Pigeon Became Extinct, via the New Yorker
Vanished Birds of North America at the Smithsonian