Lead poisoning from spent ammunition is a major cause of vulture mortality. Transitioning to non-lead ammunition protects vultures and other scavengers while preserving hunting traditions.
Vulture lead poisoning causes a prolonged and agonizing death as lead accumulates in blood and organs. Affected birds become lethargic and uncoordinated before dying over days to weeks. The source — fragmented lead ammunition in gut piles left by hunters — is easily addressed through ammunition substitution. Copper bullets perform equivalently to lead in most hunting applications. The California condor recovery program has achieved remarkable success through a combination of captive breeding and reintroduction, but lead poisoning continues to kill condors that have been reintroduced to the wild. Voluntary and regulatory programs encouraging non-lead ammunition have both shown effectiveness in reducing lead exposure in condors in treated areas.