Elegant Tern Identification Guide

Overview

The Elegant Tern (Thalasseus elegans) is a medium-large tern of the Pacific coast of the Americas, breeding primarily in a small number of colonies in the Gulf of California and southern California, then dispersing widely along the coast after breeding. It is closely related to, and often confused with, the larger Royal Tern.

Key Field Marks

• Size and shape: A medium-large tern, about 39-43 cm (15-17 in) long, distinctly smaller and slimmer than Royal Tern but larger than Forster's or Common Tern.
• Bill: Long, thin, and noticeably drooped or curved toward the tip, orange to orange-yellow in color — this slim, downcurved bill shape is the most reliable mark separating it from Royal Tern, which has a thicker, straighter, more orange-red bill.
• Head: Black cap with a distinctly shaggy, often untidy crest that extends further down the nape than Royal Tern's neater crest; in non-breeding and winter plumage the forehead becomes white/mottled, leaving a black band through the eye and a ragged crest at the back of the head.
• Body: Very pale gray upperparts and white underparts, sometimes with a faint pink flush on the breast in breeding condition.
• Legs: Black, relatively short.

Separating Elegant Tern from Similar Species

The classic confusion species is the Royal Tern: Royal Tern is bulkier, with a thicker, straighter, more deeply orange bill and a smoother crest, while Elegant Tern is more slender-bodied with a thinner, drooping bill and shaggier crest. Sandwich Tern shares a slim build but has a black bill with a yellow tip, quite different from the all-orange bill of Elegant Tern. Voice also helps: Elegant Tern's calls are higher-pitched and more rolling compared to Royal Tern's deeper, harsher calls.

Where and When to See One

Elegant Terns breed colonially, mainly on islands in the Gulf of California, Mexico, with smaller colonies in southern California (notably San Diego Bay and the Los Angeles area). After breeding in summer, birds disperse northward along the Pacific coast, regularly reaching central and northern California and occasionally further north, before moving south to winter along the coasts of Mexico, Central America, and northern South America (Peru and Chile). Post-breeding dispersal (roughly July through September) is the best time to find large numbers on beaches and estuaries well outside the immediate breeding range.

Behavior

Elegant Terns are highly colonial breeders, often nesting alongside Royal Terns, gulls, and skimmers, and form dense post-breeding flocks that roost together on sandbars and beaches. They plunge-dive for small fish, typically foraging over nearshore waters and estuaries, often in mixed tern flocks.

Voice

Calls include a rolling, grating "kee-rick" or "kirrik" and higher-pitched chattering notes, generally higher and less harsh than the deeper "keer" of Royal Tern.

Quick Reference

• Slim orange bill, distinctly drooped at the tip
• Shaggy black crest, more unkempt than Royal Tern's
• Smaller and slimmer overall than Royal Tern
• Breeds Gulf of California/southern California; disperses widely along Pacific coast after breeding