Bird

Bridled Tern

Onychoprion anaethetus

Also known as Brown-winged Tern

Bridled terns spend most of their lives soaring over warm pelagic waters, snatching small fish and squid from the ocean surface without plunge-diving. They gather in noisy, sprawling colonies on rocky tropical islets and coral cays to breed, often nesting in rocky crevices or under dense vegetation rather than on open sand. During the non-breeding season, they disperse widely across the tropical oceans, rarely coming ashore except when driven by severe storms.

PelagicSeabirdColonial

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Least ConcernConservation status

Key facts

Diet & preyFlying Fish, Juvenile Squid, Surface Crustaceans

Predators

Feral Cat
Black Rat
Silver Gull

ThreatsInvasive predators on breeding islands, plastic ingestion, and severe storms

HabitatsTropical pelagic oceans, coral reefs, and rocky offshore islands

Life span15–20 years

Classification

FamilyLaridae
SpeciesOnychoprion anaethetus

Range & activity

Range data is not available yet.

Safe observation

Interaction riskLow

Low
Moderate
High
Very high

Why interaction risk is low: Safe to observe at a normal distance.
What to notice: Look for a dark grey-brown mantle, pale grey underparts, and a white forehead patch extending behind the eye as a bridle.
Support conservation: Maintain a respectful distance from active colonies and remain on marked pathways to avoid crushing concealed ground nests.

Responsible observation

Binoculars: Scan pelagic feeding flocks from boats, watching for their buoyant, fluttering flight.
Colony Etiquette: Keep a generous perimeter around island breeding grounds to avoid flushing parents from nests.
Nesting Season: Visit designated seabird sanctuaries between spring and midsummer when adults congregate onshore.

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