Least Tern
Sternula antillarum
The Least Tern is a rare migrant to Britain, typically seen during the summer months, and is most likely to be spotted along the eastern and southern coasts. It is a small tern species that breeds in North America and northern South America, making sightings in Britain a notable event.
Field Identification Guide
Use these features to identify Least Tern in the field.
The Least Tern can be identified by its small size, yellow bill, and distinctive white forehead patch, as well as its grey back and wings. Its black crown and nape also distinguish it from other tern species.
The Least Tern is smaller than a Starling, measuring approximately 20-24 cm in length, making it one of the smallest tern species.
The male Least Tern has a grey back and wings, with a white underside and a black crown and nape, and its plumage remains relatively consistent throughout the year.
The female Least Tern is similar to the male, with no significant differences in plumage, making it challenging to distinguish between the sexes based on appearance alone.
The Least Tern's call is a high-pitched, sharp "kip" or "kit", often repeated in a series of short, staccato notes.
The Least Tern is a fish-eating specialist, diving from the air to catch small fish and crustaceans in shallow water, and is known for its agile and swift flight.
The Least Tern can be confused with the Little Tern, but can be distinguished by its yellow bill, which is shorter and more stubby than the Little Tern's black bill with a yellow tip, as well as its slightly smaller size and more subdued plumage.
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