- Ansorge's Greenbul
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Ansorge's Greenbul Eurillas ansorgei Scientific name definitions

Lincoln Fishpool and Joseph A. Tobias
Version: 1.0 — Published March 4, 2020
Text last updated October 20, 2017

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Field Identification

c. 16 cm; male 19–21 g, female c. 20 g (nominate), male 17–19 g, female 17–23g (kavirondensis). Small, short-tailed greenbul. Nominate race has top of head and neck olive-grey, lores and ear-coverts grey, slightly paler than crown, conspicuous white eyering; mantle, back and wings olive-green, rump, uppertail-coverts and tail reddish-brown; throat pale brownish-grey, underparts olive-grey, becoming warm ginger on flanks and lower belly; undertail-coverts rufous-brown; iris dark brown, brown or chestnut; bill black to dark horn, paler cutting edges; legs dark olive or greyish-olive. Distinguished from very similar E. gracilis by lack of any visible yellow tones on underparts, from E. curvirostris by contrasting grey head, from both also by voice. Sexes alike, female on average smaller than male. Juvenile is as adult, but head and breast somewhat greyer, underparts below breast paler and buffy, gape yellow, legs pale olive. Race <em>kavirondensis</em> has grey of head tinged brown, olive-green upperparts also tinged brownish, slightly greyer breast and flanks, centre of belly with faint yellowish wash (visible only in the hand), undertail-coverts yellowish-brown.

Systematics History

Editor's Note: This article requires further editing work to merge existing content into the appropriate Subspecies sections. Please bear with us while this update takes place.

Close to E. gracilis. Similarities in appearance both to that species and to E. curvirostris have resulted in much confusion, which has obscured the status of each; consequently, distribution of nominate race uncertain in many areas. Two subspecies recognized.

Subspecies


SUBSPECIES

Eurillas ansorgei ansorgei Scientific name definitions

Distribution

W Guinea E to Togo, SC Nigeria E to W Central African Republic and S Congo, NE, E and C DRCongo; also extreme SW Uganda.

SUBSPECIES

Eurillas ansorgei kavirondensis Scientific name definitions

Distribution

W Kenya.

Distribution

Editor's Note: Additional distribution information for this taxon can be found in the 'Subspecies' article above. In the future we will develop a range-wide distribution article.

Habitat

Primary and mature secondary evergreen and semi-deciduous forest. Common in dry inselberg forests in Liberia; absent from or very rare in similar habitat in Gabon. Less often in secondary habitats than is E. gracilis. Mainly lowlands; occasionally at middle altitude, e.g. 1400 m in Liberia and 1450 m in DRCongo.

Movement

Little information; believed to be sedentary.

Diet and Foraging

Fruits, including Allophylus, Macaranga and Musanga, and seeds; also insects, including orthopterans, beetles (Coleoptera), moths and caterpillars (Lepidoptera). Usually seen in pairs, sometimes in small family parties; sometimes joins mixed-species flocks. Not shy. Often forages in crown of low trees, particularly in smaller branches. Mainly in upper middle stratum (25–45 m in Liberia), tending to occur at higher levels than E. gracilis, but does descend lower to attend small fruiting trees beside tracks, sometimes with latter species.

Sounds and Vocal Behavior

Song “wheet-whuut-whit”, “tiu-wheet-tweet” or “hweet tyu-hoo hweet”, similar to that of E. gracilis but lacking its sprightliness; third syllable sometimes dropped. Also distinctive harsh, rapid, flat trill, “ritittititititit” or “tchitchitchithcithci”, not given by E. gracilis.

Breeding

Nesting recorded in May, birds in breeding condition in Jul and Oct and dependent fledgling seen in Jan in Liberia; in May, Jul and Oct–Dec in Nigeria; birds in breeding condition in Mar, Jul and Nov and juveniles in Nov in DRCongo, where species is suspected to breed through whole rainy season in NE (Ituri). One observation of a nest being built 30 m above ground. No other information available.
Not globally threatened. Status uncertain; considered uncommon to locally common, but situation unclear owing to continuing confusion with E. gracilis. Occurs in numerous national parks, including those of Sapo, in Liberia, Taï Forest, in Ivory Coast, Kakum, in Ghana, Korup, in Cameroon, Lopé, in Gabon, Nouabalé-Ndoki, in PRCongo, Salonga, in DRCongo, and Bwindi-Impenetrable Forest, in Uganda.
Distribution of the Ansorge's Greenbul - Range Map
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  • Year-round
  • Migration
  • Breeding
  • Non-Breeding
Distribution of the Ansorge's Greenbul

Recommended Citation

Fishpool, L. and J. A. Tobias (2020). Ansorge's Greenbul (Eurillas ansorgei), version 1.0. In Birds of the World (J. del Hoyo, A. Elliott, J. Sargatal, D. A. Christie, and E. de Juana, Editors). Cornell Lab of Ornithology, Ithaca, NY, USA. https://doi.org/10.2173/bow.ansgre1.01
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