Bence Mate / Collared aracari (Pteroglossus torquatus) squabbling with Montezuma oropendola (Psarocolius montezuma) Costa Rica.

Bence Mate / Montezuma oropendola (Psarocolius montezuma) hanging upside down as part of a courtship display. Costa Rica.

Bence Mate / Montezuma oropendola (Psarocolius montezuma) two interacting, Costa Rica.

Bence Mate / Montezuma oropendolas (Psarocolius montezuma) perched either side of Brown-hooded parrot (Pyrilia haematotis) in rain, Laguna del Lagarto, Santa Rita, Costa Rica

Bence Mate / Keel billed toucan (Ramphastos sulfuratus) in aggressive encounter with Montezuma Oropendola (Psarocolius montezuma) in rain, Laguna del Lagarto, Santa Rita, Costa Rica. Front cover bookplate of the H...

Bence Mate / Collared Aracari (Pteroglossus torquatus) displaying at Montezuma Oropendola (Psarocolius montezuma) Laguna del Lagarto, Santa Rita, Costa Rica

Bence Mate / Keel-billed Toucan (Ramphastos sulfuratus) in aggressive encounter with a Montezuma Oropendola (Psarocolius montezuma), Laguna del Lagarto, Santa Rita, Costa Rica

Mary McDonald / Montezuma's Oropendola (Psarocolius oropendola)perched on a Palm frond, calling, Arenal Observatory Lodge, Arenal Volcano, Costa Rica.

Lucas Bustamante / Russet-backed oropendola (Psarocolius angustifrons) building a nest. Tambopata National Reserve, Madre de Dios, Peru.

Thomas Marent / Black Oropendola (Gymnostinops guatimozinus) carrying nesting material, Rio Claro Nature Reserve, Colombia

Thomas Marent / Black Oropendola (Gymnostinops guatimozinus) collecting nest material, Rio Claro Nature Reserve, Colombia

Thomas Marent / Black Oropendola (Gymnostinops guatimozinus), Rio Claro Nature Reserve, Colombia