Chestnut-headed Oropendola Identification Guide

Key Field Marks

• Medium-large icterid (blackbird family member) with glossy black overall body plumage.
• Rich chestnut head, neck, and mantle contrasting sharply against the black wings, back, and underparts.
• Pale, whitish-blue eyes, noticeable at close range.
• Bicolored bill: black at the base, pale orange-yellow at the tip.
• Bright yellow outer tail feathers, with the central feathers black — visible as flashes of yellow when the tail is spread or in flight.
• Males are considerably larger than females, a typical oropendola trait.

Similar Species

• Montezuma Oropendola: Larger overall, with a black (not chestnut) head, more extensive orange bill tip, and bare bluish and pink facial skin patches that Chestnut-headed Oropendola lacks.
• Crested Oropendola and other icterids: Differ in head/body color pattern and lack the sharp chestnut-versus-black contrast; bill and eye color combination help confirm Chestnut-headed.

Habitat & Range

• Found in humid lowland and foothill forest, forest edge, and clearings from southern Mexico through Central America into western Colombia, Ecuador, and Bolivia.
• Nests colonially, building long, hanging woven pouch nests clustered in isolated tall trees, often over open areas or near forest edges.

Behavior

• Highly social and colonial, with multiple females nesting in the same tree, often defended by a dominant male.
• Polygynous mating system; males perform an elaborate bowing display accompanied by song while clinging to a branch, wings and tail spread.
• Feeds on fruit, large insects, and nectar, foraging in the canopy and subcanopy.

Voice

• Males give a distinctive gurgling, liquid song that builds and culminates in a burst of sound, accompanied by the bowing display.
• Also gives loud, harsh "cheorrr" or similar calls.