Common Tern Welfare in UK Colonies: Breeding Season Pressures

Common terns nest in coastal and inland colonies and face welfare challenges from predation, disturbance, and food availability during the breeding season.

Key Facts

Common terns breed in colonies on beaches, gravel banks, and specially designed rafts
UK breeding population is around 12000 pairs with significant variation between years
They are highly vulnerable to predation at colony sites from foxes, mink, and other predators
Fish availability affects breeding success with poor sand eel years causing widespread failure
Disturbance at colonies causes abandonment and whole-colony breeding failure

Welfare Considerations

Tern welfare at breeding colonies is shaped by predation pressure and food availability. A single fox or mink entering an unprotected colony can destroy entire nesting attempts across hundreds of birds within a night. Electric fence predator exclusion directly prevents this acute welfare harm. Poor fish availability in the North Sea due to climate change and overfishing causes parent birds to make unsuccessful foraging trips, increasing exhaustion and reducing chick survival. Welfare-focused colony management combines electric fence predator exclusion with monitoring of foraging success and food availability.

What You Can Do

Support RSPB and Wildlife Trust electric fence management at tern colonies
Advocate for sand eel fishery management protecting tern food supplies
Back raft installation programmes providing predator-safe nesting platforms
Avoid entering tern colonies during the breeding season
Report tern breeding success through BTO Seabird Monitoring Programme