The Grail Bird: Hot on the Trail of the Ivory-billed Woodpecker.

The ivory-billed woodpecker was the classic... people really thought it was gone.

The thrilling new sound recordings provide clear and convincing evidence that the ivory-billed woodpecker is not extinct.

The birds are relatively silent. The woods, they're like a jungle, just thick foliage, just incredibly hot, humid, buggy and snakes everywhere. Everything about it is just as bad as could be.

The video shows white tipped with black, exactly what we reproduced with a model ivory-billed wing.

Bird flu could drive the slender-billed curlew to extinction -- there are very few specimens left and the virus could just be enough to push it over the edge.