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The Ivory-bill after a decade: Just how do we know when a species is extinct?

In 2010 and 2012, five teams of researchers published studies in which they concluded either that the Ivory-billed Woodpecker was extinct or that the odds … Read More “The Ivory-bill after a decade: Just how do we know when a species is extinct?”

Eskimo Curlew, hand-colored engraving by John James Audubon (1785–1851), Wikimedia Commons. The shorebird was last recorded on Galveston Island, Texas, in 1962, over 50 years ago.