Large-billed Tern (Phaetusa simplex) [XC227615]
by Jeremy Minns from Transpantaneira, Mato Grosso, Brazil (call)
Large-billed Tern (Phaetusa simplex) [XC384529]
by Rosendo Fraga from Finca Bayano (La Jagua Marsh), Panama (flight call)
Subspecies
The following 2 subspecies are recognised:
simplex (Gmelin, 1789) - Eastern Colombia east to Trinidad, and south through Amazonia; western Ecuador.
chloropoda (Vieillot, 1819) - Basins of R Paraguay and R Paraná south-west to north-central Argentina (Santiago del Estero, very rarely Cordoba). Non-breeding visitor to Uruguay.