Bernard Castelein / Yellow-rumped cacique (Cacicus cela) calling, Madidi NP, Bolivia

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...

Luiz Claudio Marigo / Red rumped caciques with nests made from spanish moss {Cacicus haemorrhous} Brazil

Gabriel Rojo / Golden-winged cacique (Cacicus chrysopterus) vocalising in Palm tree. Pantanal, Mato Grosso, Brazil.

Bernard Castelein / Yellow-rumped cacique (Cacicus cela), group of four perched, MadidiNP, Bolivia

Bernard Castelein / Yellow-rumped cacique (Cacicus cela), Madidi NP, Bolivia

Lucas Bustamante / Yellow-rumped cacique (Cacicus cela) perched in tree, Yasuni National Park, Orellana, Ecuador.

Hermann Brehm / Yellow-rumped cacique (Cacicus cela) building nest, Pantanal, Brazil