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Abyssinian Thrush Turdus abyssinicus Scientific name definitions

Josep del Hoyo, Nigel Collar, and Guy M. Kirwan
Version: 1.0 — Published March 4, 2020
Text last updated July 8, 2018

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Field Identification

20–24 cm; 49–87 g (nominate), 52–60 g (bambusicola). Adult has upperparts dark brownish grey, becoming richer brown over forehead, crown, lores and ear-coverts, more olive-grey on chin and throat (with fine black streaking), greyish-olive upper breast, rich rufous-orange lower breast/upper belly and flanks, and white lower belly; orange bill, narrow orange eyering, ochre-yellow legs and feet. Sexes similar. Juvenile  is like adult, but streaked above, with pale spots on wing-coverts, paler with heavy spotting below. Races vary slightly in colour tones: nominate is less olive than T. olivaceus, slightly paler brown, reduced white on throat ; oldeani is like previous, but greyer on breast, and orange heavily suffused with grey; deckeni is richer and darker above than nominate, throat greyish-brown with finer streaks; <em>bambusicola</em> has throat and breast more extensively ashy, lower belly whiter; nyikae is generally darker both above and below; and baraka has lower breast to belly and flanks deep chestnut.

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.

Taxonomy complex and not fully understood. Commonly united with T. olivaceus; see remarks under that species. Differs from T. olivaceus as constituted here, however, in all-yellow bill (no dark upper culmen) (2); yellow vs non-contrasting grey eyering (2); notably blackish lores (2); and much less contrasting throat pattern (ns[1]). Total score here thus falls just short of clear support for separation, but (a) study of vocalizations may be expected to reveal further differences, (b) each taxon in each group possesses further (mosaically distributed) plumage and mensural characters, and (c) molecular evidence indicates that unification with T. olivaceus untenable (1). Proposed race mwaki (described from W Turkana, in Kenya), which implicitly also includes porini (replacement for fuscatus, described from N Nandi Forest, in Kenya), considered indistinguishable from nominate. Six subspecies recognized.

Subspecies


EBIRD GROUP (MONOTYPIC)

Abyssinian Thrush (Ngorongoro) Turdus abyssinicus oldeani Scientific name definitions

Distribution

Mbulu and Crater Highlands, in N Tanzania.

EBIRD GROUP (POLYTYPIC)

Abyssinian Thrush (Abyssinian) Turdus abyssinicus [abyssinicus Group]


SUBSPECIES

Turdus abyssinicus deckeni Scientific name definitions

Distribution
NE Tanzania (Longido S to Monduli and Mt Kilimanjaro).

SUBSPECIES

Turdus abyssinicus abyssinicus Scientific name definitions

Distribution
Eritrea and Ethiopia S to S South Sudan (Imatong Mts), N and E Uganda, N, W and C Kenya and N Tanzania (S to Loliondo).

SUBSPECIES

Turdus abyssinicus baraka Scientific name definitions

Distribution
NE DRCongo (Virunga Park) and W Uganda (Rwenzori Mts).

SUBSPECIES

Turdus abyssinicus bambusicola Scientific name definitions

Distribution
E DRCongo (highlands of Kivu S to Mt Kabobo), Burundi, Rwanda, SW Uganda (Bwindi Impenetrable Forest) and extreme NW Tanzania.

SUBSPECIES

Turdus abyssinicus nyikae Scientific name definitions

Distribution
C, E and SW Tanzania S to Nyika Plateau of N Malawi and NE Zambia.

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

Mainly highland forest of various types (including Hagenia), primary, secondary, gallery and riverine forest, edges, clearings, bamboo, giant heath, scrub and even (Burundi) moorland. Occurs from 1670 m to above 2500 m in Eritrea and Ethiopia, mainly 1830–3350 m and up to at least 4200 m in Rwenzori Mts (baraka), above 1830 m in Sudan, 950–2300 (mainly 1100–1830) m in Tanzania, 1700–2450 m in N Malawi and at 2050–2200 m in Zambia. Where it meets T. pelios, favours higher, wetter habitats than latter.

Movement

Generally resident and sedentary, but altitudinal migration without details reported in Ethiopia.

Diet and Foraging

Wide range of animal and vegetable foods. Animal food includes wide variety of insects (beetles, moths, caterpillars, grasshoppers, mantids, emerging termites, pupae and grubs), earthworms, snails, slugs, spiders, small bivalves and small fish. Vegetable material includes fruits  , including (in Rwanda) Bridelia, Ilex, Polyscias, Rytigynia, Scheffleria, Trema and Urera. Forages on open ground and in shaded cover, flicking leaf litter with bill and scratching it with feet. Occasionally picks insects off branches; fruits are usually taken in canopy, but occasionally on ground. Follows safari ants to take disturbed invertebrates.

Sounds and Vocal Behavior

Song (in E Africa) a series of unhurried, deliberate, short phrases of 5–8 clear, pleasant, typically alternating high and low notes, usually followed by short, quieter, tuneless notes or hissing trill, “tyuu-tii-tyuu-tii-tyuu-tii… tititrrrrrri”, each phrase lasting 2·5–3·5 seconds although sometimes elided into longer bouts. Some songs have distinct reeling quality, “rrriiiii-rriiiiiitu-iiiiiii…”, and at dawn has short rolling reedy song, “trrrip-trriiiit”, whereas midday song a sweet high “swii-turr-tii-turr”, etc., repeated at intervals. Calls not known to differ from those of T. olivaceus.

Breeding

Season Jul–Aug in Eritrea, Dec–Jan and Mar–Aug in Ethiopia and Jan–Apr in Sudan; Oct–Jul (peak Mar–Jun, above 2200 m mainly Dec–Apr and Sept) in Kenya, Feb–Mar, Jun–Jul and Nov in Uganda, and Aug in Tanzania; all year in DR Congo; Mar–May and Oct–Dec in Rwanda, and Sept–Dec in Zambia and N Malawi; sometimes double-brooded. Territory size variable, can be as small as 0·5 ha in N Malawi; same territory may be used for up to six years. Nest a large untidy cup (140–150 mm × 70–80 mm) of small twigs, rootlets, bark, grass, moss, lichen, leaves and bracken (nests in forest typically mainly of moss), mixed with mud, lined with fine grass and rootlets, placed c. 2–5 m up in fork in tree, bush, or climber on trunk or house; nest takes c. 10 days to build (mainly by female), dry materials may be dipped in water before incorporation. Eggs 1–4 (mainly 2–3), bluish to pale green with yellowish-brown and reddish-brown and purplish markings, size 26–29 mm × 20 mm (nominate), laid at one-day intervals; incubation period 14–15 days, presumably starts with first egg; nestling period 16 days, young capable of flight a few days later. Nesting birds attacked by Wahlberg’s Eagle (Hieraaetus wahlbergi) and White-browed Coucal (Centropus superciliosus). Lifespan at least ten years.

Not globally threatened (Least Concern). Generally common throughout large latitudinal range, and sometimes abundant, e.g. at lower elevations in Eritrea, and parts of Burundi. Known from many protected areas. In Kenya, seven times commoner in primary forest than in coniferous. In N Malawi/Zambia, will breed in patches of forest smaller than 0·5 ha, but no more than two pairs are typical in areas of 6–12 ha.

Distribution of the Abyssinian Thrush - Range Map
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Distribution of the Abyssinian Thrush

Recommended Citation

del Hoyo, J., N. Collar, and G. M. Kirwan (2020). Abyssinian Thrush (Turdus abyssinicus), 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.abythr1.01
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