Welcoming Common Terns to WWT Castle Espie
One of the world's most remarkable migratory birds returns to Strangford Lough each spring. The elegant Common Tern which is often nicknamed the "sea swallow" for its graceful flight and agile aerial displays, travels thousands of miles from its wintering grounds along the west and south coasts of Africa to breed in Ireland.
Common Terns have been a familiar sight on the islands of Strangford Lough for centuries, where they nest on shingle beaches and other open, undisturbed habitats. They also breed on gravel pits, reservoirs and riverbanks- always looking for safe places to raise their young.
Breeding colonies are facing increasing challenges. Extreme weather, rising water levels and predators can all affect nesting success which makes it harder for these remarkable birds to rear their chicks each year.
Common Terns were only occasional visitors to WWT Castle Espie until recently. In the last few years a handful of pairs have chosen to nest on the reserve and we're delighted to say that several have successfully fledged young.
One of the keys to this success has been the introduction of specially designed floating nesting rafts. These artificial islands provide ideal nesting habitat which offers terns a safe place to breed away from many of the threats found on natural shorelines. By creating this secure space, we're helping to give Common Terns the best possible chance of raising the next generation.
Watching these agile seabirds swoop, dive and fish over the lagoons is one of the highlights of spring and summer at Castle Espie. With a little luck, and the continued success of the nesting rafts, we hope even more terns will choose the reserve as their breeding home in the years ahead.
The nesting rafts were originally purchased through generous funding from Eversheds. The initial project has now come to an end but their legacy lives on. The rafts continue to provide valuable breeding habitat, supporting Common Terns as part of WWT Castle Espie's ongoing conservation work.
If you're visiting Castle Espie this spring or summer, keep an eye out for these incredible long-distance travellers. With their striking black caps, silver-grey wings and unmistakable aerial acrobatics, Common Terns are a joy to watch, and every successful nesting season is another step towards securing their future on Strangford Lough.
Photograph taken by Jonny Clark in July 2026.
