Wildlife

Common Tern Welfare in Breeding Colonies

Common terns breed in noisy, densely packed colonies and face threats from disturbance, predation and climate-driven food shortages. Their welfare during breeding reflects both colony management and marine food availability.

Key Facts

UK breeding population around 12,000 pairs — relatively stable but locally threatened
Nests on shingle beaches, gravel islands and specially created tern rafts
Fierce defenders of nests — adults repeatedly mob intruders including humans
Sand eel availability crucial — 4-fish loads per visit typical in good years
Climate change is shifting sand eel distribution northward away from tern colonies

Welfare Considerations

Common terns in colonies with insufficient sand eels show measurable chick starvation — birds fed only one or two fish daily fail to develop properly and die before fledging. Adult birds show elevated stress hormones when repeatedly disturbed. Successful colonial breeding requires predictable food supply within 10-15km of the nest site. Nature reserve management that installs tern rafts and excludes mammalian predators dramatically improves chick welfare outcomes.

What You Can Do

Keep dogs on leads and stay on paths near coastal breeding bird reserves
Support RSPB coastal habitat management
Advocate for marine protected areas covering sand eel feeding grounds
Donate to conservation organisations managing tern colonies
Report oil pollution incidents that affect marine prey fish