Chivi Vireo

Overview

The chivi vireo (Vireo chivi) is a small South American songbird that was formerly considered a subspecies of the red-eyed vireo. It is characterised by green to yellow-green upperparts, off-white underparts, and a gray crown, with nine distinct subspecies recognised across its range.

Identification

• Small songbird, 12–14 cm in length, with green to yellow-green upperparts and off-white underparts, some subspecies exhibiting brighter yellow flanks and vent.
• Gray crown with thin, well-defined gray borders and a whitish supercilium extending over dull gray ear coverts.
• Bill is short, with the upper mandible varying from black to dusky gray and the lower mandible being pale to blue-gray with a dark tip.
• Song is typically a pattern of brief musical sounds with pauses, transcribed as 'chew-lee chew-lew wee-chee chew leee' for southern subspecies and 'chee’wee? chee’wip' in Bolivia.

Habitat

Found throughout most of northern, eastern, and central South America, excluding southern Chile and Argentina. It inhabits the canopy and subcanopy of dry to wet forests, light woodland, gallery forest, and secondary growth with tall trees, often adjusting well to slightly disturbed habitats.

Diet

Primarily an insectivore that feeds on arthropods, especially caterpillars and other insect larvae. Some populations also consume fruit from a variety of tree species and may act as important seed dispersers, while others are suspected to be nectarivorous.

Did you know?

The specific epithet 'chivi' is an onomatopoeia for its song, which the 19th-century French ornithologist Louis Pierre Vieillot rendered as 'chivi-chivi' when he described the species in 1817.