Common, arctic, little, Sandwich, and roseate terns nest in vulnerable coastal colonies that are highly sensitive to disturbance, predation, and extreme weather. Colony protection is essential for welfare and conservation.
Key Facts
Five tern species breed in the UK: common, arctic, little, Sandwich, and the rare roseate tern
Tern colonies are vulnerable to disturbance: a single dog or person walking through a colony can cause total breeding failure
Little terns nest on sandy beaches at the highest strandline, directly competing with beach recreation for space
Roseate terns are amber listed with only approximately 100 breeding pairs in the UK, all at a handful of protected sites
Terns are highly aggressive when defending nests and will dive-bomb and defecate on intruders, but this does not prevent colony abandonment
Climate change is increasing the frequency of storm surge events that flood low-lying tern nesting sites, causing egg and chick mortality
Welfare Considerations
Tern colony welfare is most acutely threatened by disturbance and predation. A single disturbance event that causes adults to flush from nests leaves eggs and chicks exposed to predation by gulls and crows that are watching the colony. On hot days, unshaded eggs and chicks can die from overheating within minutes of adult departure. Repeated disturbance causes colony abandonment, resulting in total breeding failure across the entire colony. The welfare harm at colony level is therefore disproportionate to the disturbance cause: one uncontrolled dog can cause the loss of hundreds of eggs and chicks. Conservation wardens at key sites, physical exclusion fencing around nest areas, and public education significantly reduce disturbance welfare harm. Climate change mitigation is the long-term welfare requirement: storm surges that flood nesting areas are increasing in frequency with direct consequences for egg and chick survival.
What You Can Do
Never approach tern nesting colonies and keep dogs on leads in coastal areas during breeding season
Respect signed tern protection zones even if access is not physically blocked
Support RSPB and Wildlife Trust warden programmes at tern nesting sites
Report disturbance at tern colonies to the site managing organisation immediately
Advocate for climate action to reduce the storm surge events flooding coastal nesting sites
Donate to seabird conservation organisations working on tern colony protection