Lead ammunition fragments in gut piles and carcasses poison raptors, corvids, and scavengers who ingest spent bullets when feeding on hunted animals.
Lead poisoning in birds is an excruciating multi-day death involving neurological deterioration, inability to stand or fly, and organ failure. Eagles, condors, ravens, and other scavengers are exposed every hunting season when feeding on gut piles containing lead fragments. Copper ammunition eliminates this welfare harm entirely at similar cost.