Bridled Tern Identification Guide

Key Field Marks

• Size & shape: A medium-sized tern with a slim body, long forked tail with white outer edges, and a slender, pointed bill.
• Upperparts: Grayish-brown to sooty-brown (not blackish), giving a softer, paler-backed look than its closest relative.
• Head pattern: White forehead patch extends back as a long, thin white supercilium ("bridle") that reaches behind and above the eye — the feature giving the species its name.
• Underparts: Clean white below, contrasting with the darker upperparts; a thin pale collar separates the dark cap from the back.

Separating from Similar Species

• Sooty Tern: The primary confusion species. Sooty Tern has a blacker, more uniform back, and its white forehead patch is shorter, not extending behind the eye as a supercilium the way Bridled Tern's does.
• Bridled Tern also tends to look slightly paler and browner overall in flight compared to the crisper black-and-white contrast of Sooty Tern.
• Juveniles of both species are dark and mottled; careful attention to back tone and head pattern remains the best approach even in immature plumages.

Habitat, Range & Season

• A highly pelagic species of warm tropical and subtropical oceans worldwide, rarely seen from shore except after storms.
• Breeds colonially on remote, often rocky or sparsely vegetated tropical islands.
• Spends most of the year far out at sea away from breeding colonies, making sightings from land or nearshore waters unusual and often storm-driven.

Voice

• Gives a distinctive barking or yapping "wep" or "wep-wep" call, mainly heard at breeding colonies.
• Largely silent while foraging over open ocean far from land.