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Mute Swan: Welfare of Britain's Largest Waterbird

An in-depth guide to mute swan welfare, the ongoing threats they face, and conservation management.

Key Facts

Mute swans are among the UK's heaviest flying birds, weighing up to 15kg
Lead poisoning from ingested fishing weights caused massive population declines before the 1987 ban
Populations have recovered strongly since lead fishing weights were banned
Collision with overhead power lines is now the leading cause of swan mortality
Territorial aggression can be misunderstood — swans are simply protecting their nests and cygnets
Mute swans are protected under the Wildlife and Countryside Act 1981

Welfare Considerations and Management

Mute swan welfare threats include power line collisions (particularly during flight), fishing line and hook entanglement causing injuries, ingestion of remaining lead fishing weights and other lead items, oil contamination, and illegal persecution. Power line diversion and marking programmes reduce collision mortality. Volunteer swan rescue networks operate across the UK. Lead item ingestion from anglers discarding tackle remains a welfare concern despite the ban on lead weights.

What You Can Do

Report injured swans to the RSPCA, RSPB, or local swan rescue organisations immediately
Never leave fishing line or tackle near water — entanglement causes serious swan injuries
Support non-toxic fishing weight alternatives to protect swans and other waterbirds
Maintain respectful distance from nesting swans — their defensive behaviour protects their cygnets