Several species of Asian vulture are experiencing a faster rate of decline in their population than even the dodo (that's not a distinction any species wants).
The white-backed vulture of Indai (see below) is down to one thousandth of its population of 1992 (only 16 years). Conservationists point to the usage of anti-inflamatory drugs (diclofenac) given to livestock (upon whose carcasses these birds dine), which induces kidney failure in the birds.
The only way to preserve this bird is to stop the use of diclofenac in livestock and to expand captive breeding programs (which have proven successful). Otherwise, we're looking at extinction in about a decade of three Asian vulture species.