Phaetusa simplex
The Large-billed Tern (Phaetusa simplex) is a striking medium-large tern, measuring 38-42 cm (15-17 in) in length with a wingspan of 96-105 cm (38-41 in) and weighing around 200-280 grams. Its most distinctive feature is its massive, banana-yellow bill, noticeably larger and brighter than that of other terns. Adults display a crisp white body, pale grey upperparts, a contrasting black cap that extends to the nape, and a deeply forked tail. A unique identification mark, often visible in flight...
Exclusively found in freshwater systems, inhabiting large tropical rivers, lakes, and estuaries, particularly associated with extensive sandbars and beaches for nesting. Primarily occurs at low elevations, rarely straying into coastal marine environments.
Feeds predominantly on small fish, especially those found in freshwater rivers and lakes, supplementing its diet with aquatic invertebrates. Forages primarily by plunge-diving or surface-dipping from flight.
Large-billed Terns are diurnal and highly social, often nesting in dense colonies on exposed sandbars, sometimes alongside Black Skimmers (Rynchops niger) or other tern species. Their primary foraging strategy involves swift, shallow plunge-dives or surface-dipping to snatch fish near the water's...
The Large-billed Tern boasts a wide distribution across tropical and subtropical South America, primarily inhabiting the vast freshwater systems east of the Andes. Its breeding range spans the major river basins including the Amazon, Orinoco, Paraguay, Paraná, and Uruguay rivers, extending from V...
Least Concern
- The Large-billed Tern possesses one of the most disproportionately large bills among all tern species, often described as 'banana-like' due to its bright yellow color and robust size. - It is the only tern species in the world known to have completely white primary feather shafts, a unique iden...