Roseate Tern

The Roseate Tern is a slender, graceful seabird named for the faint pink flush that can appear on the breast feathers of breeding adults, though this tint is subtle and not always visible in the field. It breeds in scattered colonies across parts of the Atlantic, Indian, and Pacific Oceans, often nesting alongside other tern species.

Appearance

Adults have very pale gray upperparts, white underparts, a black cap in breeding plumage, and exceptionally long, thin tail streamers that extend well beyond the folded wingtips at rest. The bill is mostly black with a red base that expands as the breeding season progresses, and the legs are red-orange.

Key field marks

• Extremely long, thin tail streamers, longer than in most other terns
• Very pale, almost white upperparts that look paler than Common Tern
• Black bill with a variable amount of red at the base
• Fast, stiff wingbeats and a distinctive harsh call

Similar species

Roseate Terns are most easily confused with Common Tern and Arctic Tern. Common Tern has a darker gray back, shorter tail streamers, and more red on the bill. Arctic Tern has shorter legs, an all-red bill in breeding season, and a more uniformly gray body. The Roseate's pale back, blacker bill, and longer streamers help separate it once seen well.

Habitat and range

Roseate Terns breed colonially on offshore islands, rocky islets, and sandy or vegetated coastal habitats, frequently nesting among or near Common Tern colonies for protection. Breeding populations are scattered across the northeastern Atlantic coast of North America, the Caribbean, western Europe, and parts of Africa, the Indian Ocean, and the western Pacific.

Migration

North Atlantic breeders migrate long distances to winter along the coasts of South America and West Africa. Because colonies are small, localized, and vulnerable to predation and human disturbance, several regional populations are legally protected and closely monitored.

Behavior

Roseate Terns forage by plunge-diving from height into open water, often farther offshore than other terns, targeting schools of small fish driven to the surface by predatory fish or dolphins. They are strongly colonial and gregarious, frequently associating with Common Terns.

Voice

The most distinctive call is a harsh, grating "aach" or "chi-vik," quite different from the softer calls of Common Tern, and useful for picking the species out within mixed colonies.

Nesting and breeding

Pairs typically nest in dense colonies, often using natural cover such as rocks, vegetation, or driftwood to conceal the nest scrape. They lay one to two eggs, and both parents share incubation and chick-feeding duties over a breeding season that can extend through the summer months.