人口不足
More than half of the Old World vulture species are listed as vulnerable, endangered, or critically endangered by the IUCN Red List. Population declines are caused by a variety of threats that vary by species and region, with most notable declines in Asia due to diclofenac use. As vultures play an important role in ecosystems, their population decline can have cultural, public health, and economic implications for communities. Within Africa, a combination of poisonings and vulture trade (including use as bushmeat and traditional medicine) account for roughly 90% of the population declines.