The third largest in the world amongst all woodpeckers the Ivory-billed Woodpecker was a bird of old-growth forests of the Southeast. Destruction of its forest habitat caused severe population declines in the 1800s, and only a handful of birds remained into the 20th century. It was thought to have gone extinct in the middle of the twentieth century. The bird was rediscovered in the "Big Woods" region of eastern Arkansas in 2005, but has proven difficult to relocate since then.
Reason why Threatened:
Due to habitat destruction, and to a lesser extent hunting, its numbers have dwindled to the point where it is uncertain whether any remain, though there have been reports that it has been seen again. Almost no forests today can maintain an ivory-billed woodpecker population.