Old World and New World vultures face population crises from poisoning, lead contamination, and persecution that involve individual suffering at scale while eliminating critical ecosystem services from carrion removal.
Vultures poisoned in targeted or incidental events die from acute toxicity — convulsions, organ failure, and prolonged distress over hours to days. Lead poisoning causes progressive neurological deterioration before death. The welfare cost per poisoning event multiplies across hundreds of birds gathering at a single poisoned carcass. The loss of vultures from ecosystems removes a critical health service, with downstream welfare effects on other wildlife through increased disease pressure.