Once a common sight in Asian skies, the bird's numbers have sunk by 99.9 percent since surveys began in the 1990s, in part from ingesting a deadly anti-inflammatory drug, called diclofenac, found in dead livestock.

Not only are rare birds getting rarer, but migratory songbirds, seabirds, and even common backyard birds are also plummeting, according to the State of the World's Birds, a report released in October 2008 by the U.K. nonprofit BirdLife International.

Photograph by Marek Jobda/rarebirdsyearbook.com/courtesy BirdLife International

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