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...

Guy Edwardes / Montezuma oropendola (Psarocolius montezuma) calling, Costa Rica.

Alex Hyde / Montezuma oropendola (Psarocolius montezuma) Cordillera de Talamanca mountain range, Caribbean Slopes, Costa Rica

David Tipling / Montezuma Oropendola (Psarocolius montezuma) displaying in Cecropia tree, Costa Rica.

Stephen Dalton / Montezuma oropendola (Psalocorius montezuma) perched, Costa Rica

David Tipling / Montezuma Oropendola {Psaracolius / Gymnostinops montezuma} feeding in fruiting tree, Tikal, Guatemala

Patricio Robles Gil / Montezuma oropendola at nest {Gymnostinops montiezuma} Yucatan, Mexico

Robin Chittenden / Montezuma oropendola (Psarocolius / Gymnostinops montezuma) nests at the top of a very tall tree, Costa Rica, March