Hermann Brehm / Large-billed Tern (Phaetusa simplex) Pantanal, Brazil

Hermann Brehm / Large-billed tern (Phaetusa simplex) with mouth wide open, Pantanal, Brazil.

Pete Oxford / Large-billed tern (Phaetusa simplex) at edge of water. Northern Pantanal, Mato Grosso, Brazil.

Ben Cranke / Large-billed Tern (Phaetusa simplex) pair, perched on a tree log, Mato Grosso, Pantanal, Brazil. August.

Angelo Gandolfi / Large-billed tern (Phaetusa simplex) in flight by coast, Santa Catarina, Brazil, September.

Angelo Gandolfi / Large-billed terns (Phaetusa simplex) in non-breeding plumage (above) and breeding plumage (below), Santa Catarina, Brazil, September.

Luiz Claudio Marigo / Large-billed Tern (Phaetusa simplex) in Lake Mamiraua, Mamiraua Sustainable Development Reserve, Alvaraes, Amazonas State, Northern Brazil.

Robin Chittenden / Large-billed tern (Phaetusa simplex) in flight, Trinidad, April.

Robin Chittenden / Large-billed tern (Phaetusa simplex) perched on post, Trinidad, April

Glenn Bartley / Large-billed Tern (Phaetusa simplex), Ecuador

Paul Williams / Large billed tern (Phaetusa simplex) in flight, Pantanal, Brazil

Paul Williams / Large billed tern (Phaetusa simplex) in flight, Pantanal, Brazil

Luiz Claudio Marigo / Large-billed terns (Phaetusa simplex) four perched, Los Haitises National Park, Samanai Province, in the Dominican Republic, Espaaola Island, Caribbean Sea.

Pete Oxford / Large-billed Tern (Phaetusa simplex) in flight. Orinoco River, Apure Province, Venezuela.

Pete Oxford / Large-billed Tern (Phaetusa simplex) in flight. Orinoco River, Apure Province, Venezuela.

Pete Oxford / Large-billed Tern (Phaetusa simplex) in flight. Orinoco River, Apure Province, Venezuela.

Mary McDonald / Large-billed Tern (Phaetusa simplex) flying in the Pantanal, Brazil

Luiz Claudio Marigo / Large-billed Terns (Phaetusa simplex) Mamirauá Lake, Mamirauá Sustainable Development Reserve, Amazonas State, Northern Brazil.

Daniel Gomez / Man taking Large billed tern {Phaetusa simplex} eggs from nest. Brazil.

Daniel Gomez / Man taking Large billed tern {Phaetusa simplex} eggs from nest. Brazil.

Daniel Gomez / Man holding five Large billed tern eggs in hand {Phaetusa simplex} Brazil.

Daniel Gomez / Man by Large billed tern {Phaetusa simplex} eggs. Brazil.

Thomas Marent / Large-billed Tern (Phaetusa simplex), Los Llanos, Colombia

Robin Chittenden / Large-billed tern (Phaetusa simplex) on post, Trinidad, April

Robin Chittenden / Large billed tern (Phaetusa simplex) on post, Trinidad, April

Pete Oxford / Two Large-billed terns (Phaetusa simplex) standing at water's edge, one with fish prey in beak, Pantanal, Mato Grosso, Brazil.

Roland Seitre / Large-billed Tern (Phaetusa simplex) flying, Bolivia

Sylvain Cordier / Large-billed tern (Phaetusa simplex) , in flight Pantanal, Mato Grosso, Brazil.