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Bicolored Antvireo Dysithamnus occidentalis

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  • Bicolored Antvireo male
  • © Dusan Brinkhuizen

The Bicolored Antvireo is a poorly known species of antbird in the genus Dysithamnus that has a disjunct range in western Colombia, eastern Ecuador, and northern Peru. At least three different subspecies involved. It is mainly found in the subtropical zone at middle elevations in the Andes, and appears to be associated with Chusquea bamboo. Males are mostly uniform dark grayish-black, with faint white tips to the wing coverts forming rows of dots on the wings. Females are slaty gray below, brown above, with a brighter chestnut crown. Most likely overlaps (in eastern Ecuador) with very similar White-streaked Antvireo (Dysithamnus leucostictus), but is generally found at higher elevations. Females are quite different, and have bold white streaking on the face and underparts. In Ecuador it has two main vocalizations, a rapid “ji-ji-jerrr,” and a mellow “tew.” In Northern Peru, this species has a more “typical” antvireo song, a descending series of mellow whistles “wee-wee-wee-wu-wuwuwu” speeding up at the end, but this vocalization has not been detected for certain in Ecuador. Song of White-streaked Antvireo much slower. Formerly placed in the genus Thamnomanes and called “Western Antshrike.”

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Calls

© Andrew Spencer

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  • Year-round
  • Migration
  • Breeding
  • Non-breeding

Recommended Citation

Bicolored Antvireo (Dysithamnus occidentalis), In Neotropical Birds Online (T. S. Schulenberg, editor). Cornell Lab of Ornithology, Ithaca, New York, USA. retrieved from Neotropical Birds Online: https://neotropical.birds.cornell.edu/Species-Account/nb/species/bicant4