Grauer's Warbler Graueria vittata

Taxonomically unusual though not very boldly marked warbler. In poor light, or at a distance, looks dingy overall. A good look reveals a brown-olive back, and underparts that are heavily marked with fine barring. Found in thick understory tangles in montane forest of the Albertine Rift. Usually detected by its odd voice: a high, short, rising trill which sounds more like an insect than a bird. Most likely to be confused with Green-backed Camaroptera, but is larger, has a dark rather than red eye, and has fine barring below.