The Ivory-billed Woodpecker is one of the largest woodpeckers in the world, at roughly 20 inches in length and 30 inches in wingspan. It was native to the virgin forests of the southeastern United States (along with a separate subspecies native to Cuba). Due to habitat destruction, and to a lesser extent hunting, its numbers have dwindled to the point where it is uncertain whether any remain. Almost no forests today can maintain an Ivory-billed Woodpecker population. The species is listed as critically endangered. The American Birding Association (ABA) lists the Ivory-billed Woodpecker as a Class 6 species, a category the ABA defines as “definitely or probably extinct. Reports of at least one male Ivory-billed Woodpecker in Arkansas in 2004 were investigated and subsequently published in April 2005 by a team led by the Cornell Lab of Ornithology. No definitive confirmation of those reports emerged, despite intensive searching over five years following the initial sightings. A $10,000 reward was offered in June 2006 for information leading to the discovery of an Ivory-billed Woodpecker nest, roost or feeding site. In December 2008, the Cornell Lab of Ornithology announced a reward of $50,000 to the person who can lead a project biologist to a living Ivory-billed Woodpecker. In late September 2006, a team of ornithologists from Auburn University and the University of Windsor published reports of their own sightings of Ivory-billed Woodpeckers along the Choctawhatchee River in northwest Florida, beginning in 2005 . These reports were accompanied by evidence that the authors themselves considered suggestive for the existence of Ivory-billed Woodpeckers. Searches in this area of Florida through 2009 failed to produce definitive confirmation.