Little Tern

The Little Tern is one of the smallest members of the tern family, a compact, energetic seabird found breeding across much of Europe, Asia, and Africa. Despite its diminutive size, it undertakes long migrations between temperate breeding grounds and tropical or subtropical wintering areas.

Appearance

Adults in breeding plumage show pale gray upperparts, white underparts, a black cap that stops short of the bill leaving a bright white forehead triangle, and a yellow bill tipped with black. The legs are orange-yellow. In flight, a dark leading-edge wedge on the outer primaries is a useful identification feature. Non-breeding adults and juveniles lose the black cap and yellow bill, becoming duller with a dark bill and streaky crown.

Key field marks

• Very small size, noticeably smaller than any other regularly occurring tern
• White forehead patch contrasting with black rear crown in breeding plumage
• Yellow bill with a black tip
• Orange-yellow legs
• Rapid, buoyant flight with quick wingbeats and frequent hovering before diving

Similar species

The Little Tern is easily confused with the Least Tern of the Americas, which is now treated as a separate species but is nearly identical in size and plumage; range is the best way to separate them. Larger terns such as Common or Arctic Tern lack the white forehead patch and yellow bill, and are noticeably bigger with longer, more graceful proportions.

Habitat and range

Little Terns breed on open, unvegetated sand, shingle, and shell beaches, as well as sandbars along rivers and coastal lagoons, usually near shallow water for foraging. The species breeds across coastal Europe, parts of Asia, and Africa, with disjunct populations recognized as subspecies in some regions.

Migration

European and West Asian breeders migrate to winter along the coasts of West and East Africa, while Asian populations move to South and Southeast Asia and Australia. Because their nesting beaches are also popular with people, breeding colonies are vulnerable to disturbance, predation, and habitat loss.

Behavior

Little Terns forage by hovering over shallow water and plunge-diving for small fish and invertebrates, often close to shore. They are highly colonial nesters, forming dense but often small colonies on bare ground where a scrape nest is used.

Voice

The call is a sharp, high-pitched "kirrik" or chattering "kit-kit-kit," often given in alarm when colonies are approached.

Nesting and breeding

Pairs lay two to three eggs directly on sand or shingle with minimal nest material, relying on camouflage for protection. Both parents incubate and defend the nest with aggressive dive-bombing of intruders. Chicks are precocial and can leave the scrape within days of hatching, though they remain dependent on parents for food.