Family Typical Antbirds (Thamnophilidae)

Least Concern

Undulated Antshrike (Frederickena unduliger)


Taxonomy

French: Batara ondé German: Dunkelameisenwürger Spanish: Batará ondulado
Taxonomy:

Thamnophilus unduliger

Pelzeln

, 1868,

Rio Içanna, north-west Brazil

.

Races defined on basis of female plumages, but racial assignment of specimens often difficult because of extensive individual (though possibly age-related) variation, even among females from same locality. Form fulva recently elevated to species level#R on basis of slower (effect size 3.55; score 2), more rising (effect size 3.9; score 2) loudsong#R, but plumage differences between fulva and adjacent diversa very difficult to determine. Emendation of specific epithet to “unduligera” is unjustified#R. Four subspecies recognized.

Subspecies and Distribution
  • F. u. fulva J. T. Zimmer, 1944 – Fulvous Antshrike – SE Colombia (E Cauca, W Caquetá, W Putumayo), E Ecuador and E Peru (N of R Marañón and R Amazon), possibly extending E into Brazil (Amazonas N of R Solimões).
  • F. u. unduliger (Pelzeln, 1868) – Undulated Antshrike – NW Amazonian Brazil on upper R Negro, possibly extending S to N bank of R Solimões.
  • F. u. diversa J. T. Zimmer, 1944 – E Peru (S of R Marañón and R Amazon), NW Bolivia (S La Paz, extreme S Beni) and W Amazonian Brazil (S of R Amazon, E to R Juruá).
  • F. u. pallida J. T. Zimmer, 1944 – SW Amazonian Brazil (S of R Amazon, R Purus to R Madeira), probably also NC Bolivia (E Pando).
  • Descriptive notes

    23 cm; 75–85 g. Prominent crest; iris colour varies from brown to pale yellow, possibly related to age or population, or to both. Male is black, with irregular fine... read more

    Voice

    Loudsong varies regionally: race fulva gives a long series (e.g. 7–20 notes, 4... read more

    Habitat

    Dense understorey of lowland evergreen forest, to 1100 m. Almost always associated with dense... read more

    Food and feeding

    Not well known. Feeds on a variety of insects, including beetles (Coleoptera), katydids and grasshoppers (Orthoptera) and hairy... read more

    Breeding

    Little information. A nest of race fulva found in NE Ecuador was a large, thin-walled cup made of rootlets, attached by the rim to... read more

    Movements

    None recorded; presumed resident throughout its range.

    Status and conservation

    Not globally threatened (Least Concern). Seemingly an uncommon to rare, low-density species throughout most of its range, which includes vast areas of intact suitable habitat... read more

    Recommended citation

    Zimmer, K., Isler, M.L. & de Juana, E. (2018). Undulated Antshrike (Frederickena unduliger). In: del Hoyo, J., Elliott, A., Sargatal, J., Christie, D.A. & de Juana, E. (eds.). Handbook of the Birds of the World Alive. Lynx Edicions, Barcelona. (retrieved from https://www.hbw.com/node/56653 on 15 December 2018).