Ivory Billed Woodpecker

You might not have heard of the ivory billed woodpecker, but it could well be the most endangered animal in the world. That is, if it is not already extinct. This bird exists (or perhaps existed) in the Southeastern part of America, but 10 years ago it was believed to have become extinct. However, there are still occasional reports of sightings in Florida and Arkansas. Sadly, no definitive proof has been found that a population still exists. [Source]