J. F. Gmelin, 1789,
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). 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#R. 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.
Food and feeding
Status and conservation
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