Bridled Tern

Identification

The bridled tern is a medium-sized tern measuring 30–32 cm in length with a wingspan of 77–81 cm, making it similar in size to the common tern but noticeably more heavily built. Its most distinctive features are its dark grey upperparts contrasted with white underparts, a white forehead and eyebrows, and a striking white collar on the hindneck. The bird has a long, deeply forked tail, black legs, and a black bill. Juveniles are scaly grey above and pale below, helping distinguish them from adults during their early months.

This species is unlikely to be confused with any tern except for two similarly dark-backed relatives: the sooty tern and the spectacled tern of the tropical Pacific. The bridled tern is paler-backed than the sooty tern but darker than the grey-backed species, and it can be distinguished from both by its narrower white forehead and distinctive pale neck collar.

Range & Habitat

The bridled tern is a migratory and dispersive bird of tropical oceans with markedly marine habits compared to most of its relatives. Four subspecies are recognised: the Atlantic melanopterus breeds in Mexico, the Caribbean, and west Africa; antarcticus occurs around the Arabian Peninsula and the western Indian Ocean; anaethetus inhabits the eastern Indian and Pacific Oceans; and nelsoni is found along the west coast of Mexico and Central America. The species winters more widely through the tropical oceans and is a rare vagrant to western Europe.

Behaviour & Diet

Bridled terns breed in colonies on rocky islands, nesting in ground scrapes or holes and laying a single egg. They feed by plunge-diving for fish in marine environments, though they will also pick food from the water's surface in the manner of black terns and gull-billed terns. Unlike arctic terns, they typically dive directly rather than from the "stepped-hover" technique. Male bridled terns offer fish to females as part of their courtship display, a behaviour important to their breeding success.

Best Time & Places to See It

To encounter bridled terns, focus on tropical ocean regions where the various subspecies are established. The Atlantic subspecies can be found in Mexico, the Caribbean, and west Africa during breeding season. Indian Ocean and Pacific visitors should seek them in their respective ranges, particularly around rocky islands where breeding colonies gather. Winter months bring wider dispersal through tropical oceans, increasing chances of encounters across broader geographic areas.

Photography Tips

The bridled tern's striking white facial markings and neck collar provide excellent contrast for photography, particularly when birds are perched or in breeding colonies. The bird's direct plunge-diving technique offers dynamic shooting opportunities for action photographers. Patient positioning near rocky island colonies during breeding season will yield the best results, allowing photographers to capture both courtship interactions and feeding behaviour. The distinctive white forehead and eyebrow pattern should be clearly visible in successful identification shots.