Sandwich Tern (Thalasseus sandvicensis) lives in coastal beaches across Europe, Africa, Americas. It feeds on fish and crustaceans. Its conservation status is Least Concern.
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At just under half a meter across, the Sandwich tern spans 95-105 cm (37-41 in) wing-to-wing and measures 36-41 cm (14-16 in) from beak to tail, weighing only 200-300 g, about the heft of a deck of cards. This compact, agile build lets it zip over the sea and plunge-dive for fish with barely a ripple. Its size makes it unmistakable among coastal birds, helping birdwatchers spot it even in crowded colonies.
Globally, there are between 460,000 and 500,000 Sandwich terns, a population size that keeps the species in the IUCN's Least Concern category. Yet this figure masks regional pressures; a single disease outbreak can cause mass mortality in a colony, showing why sheer numbers alone don't guarantee security.
When they breed, Sandwich terns pack nests a mere 20-30 cm (7.9-11.8 in) apart, forming thickets so dense they look like a living carpet on the ground. This crowding deters predators because any attack would disturb dozens of neighbours, but it also creates a perfect storm for disease spread.
The species' love of tight colonies turned it into a casualty of the 2021-2023 highly pathogenic avian influenza (HPAI) wave, with mass deaths reported across northwestern Europe in 2022. Older, experienced birds died at higher rates, threatening future breeding success, highlighting how disease can erode population resilience.
A British-breeding Sandwich tern covering over 10,000 km to winter along Africa's west coast from Senegal down to South Africa. Those nesting by the Caspian Sea head east to the Indian Subcontinent, reaching as far as Sri Lanka.
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As the Sandwich Tern takes to the skies, its sleek, grey and white form slices through the air with effortless ease, its long, pointed wings beating in a slow, measured rhythm that belies the swift and agile hunter that lies beneath. With a swift, darting motion, it plunges into the waves below, emerging triumphant with a silvery fish clutched tightly in its beak, a testament to its remarkable adaptability and cunning in the pursuit of its next meal. In the bustling colonies where it breeds, the Sandwich Tern's melodious, keening calls fill the air, a cacophonous symphony that echoes across the coastal landscape.
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