North America's smallest tern — under 6 inches long with bright yellow bill and black cap. Interior populations along the Mississippi/Missouri are federally endangered, but they've adapted to nesting on industrial gravel rooftops in some cities.
§ Quick facts
§ Encyclopedia
The least tern is a species of tern that breeds in North America and locally in northern South America. It is closely related to, and was formerly often considered conspecific with, the little tern of the Old World. Other close relatives include the yellow-billed tern and Peruvian tern, both from South America.
Source: Wikipedia — Least tern Licensed under CC BY-SA 4.0
§ Identification
Field marks. Tiny pale tern with a yellow bill (black tip), a black cap with a white forehead wedge, and yellowish legs. Fast, fluttering wingbeats.
Similar species. Other terns are larger with red, orange, or black bills; the small size, yellow bill, and white forehead are diagnostic.
Voice. A sharp, high, excited 'kip-kip-kiddeek' and rapid chittering around colonies.
§ Diet & behavior
Diet. Small fish caught by plunge-diving or surface-snatching.
Behavior. North America's smallest tern; hovers and plunge-dives for tiny fish and nests on bare sandy beaches and gravel rooftops, making it vulnerable to disturbance.
§ Range
Coastal US in summer; some inland populations on big rivers
§ Habitat
Sandy beaches, river sandbars, salt flats
§ Threats
Beach disturbance, vehicle traffic on nesting beaches, dam-driven river sandbar loss.
§ Conservation status
According to the IUCN Red List, the least tern is currently classified as Least Concern.
§ What helps
Respect beach closures. Advocate for sand-bar restoration on dammed rivers. Support rooftop tern colonies.
§ Further reading
- Wikipedia — Least tern
- www.fws.gov — authoritative profile of Sternula antillarum
- IUCN Red List — search for Sternula antillarum
- GBIF occurrence records
- Encyclopedia of Life — Sternula antillarum
§ Sources cited
- Cornell Lab of Ornithology — All About Birds
- National Audubon Society
- iNaturalist
- IUCN Red List
