Sandwich Tern

Thalasseus sandvicensis

The Sandwich tern is a tern in the family Laridae. It is very closely related to the lesser crested tern, Chinese crested tern, Cabot's tern, and elegant tern and has been known to interbreed with both elegant and lesser crested terns. It breeds in the Palearctic from Europe to the Caspian Sea, and winters in the Mediterranean and on the coasts of Africa, India, and Sri Lanka. Source

Where it is now

In the last 8 weeks this bird was recorded 10,137 times across 59 areas (each area is a 5 degree square).

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Movement and weather

Each season it is first heard regularly where daytime highs are around 27°C (typically 8 to 29°C, from 12 areas). That range is wide, so temperature alone does not explain when it turns up.

Arrival dates

The week it was first heard regularly in each region, after at least six weeks away. Dates differ from south to north, so a region has a range.

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Figures are effort corrected and come from automatic sound identification, which makes mistakes. How this is measured and how it compares with human observers.