Mute swans and other waterfowl face lead poisoning from anglers' weights and shot. The switch to non-toxic alternatives has dramatically reduced but not eliminated this preventable welfare harm.
Lead poisoning in swans causes prolonged neurological deterioration and death - a preventable welfare harm that has been substantially but not completely eliminated through regulation. Residual illegal lead use and shot contamination of water bodies continues to cause cases. Rehabilitation of affected swans provides individual welfare relief while advocacy for complete lead elimination addresses the systemic cause.