Family Reed-warblers (Acrocephalidae)


Papyrus Yellow Warbler (Calamonastides gracilirostris)


French: Jaunerolle aquatique German: Papyrusspötter Spanish: Zarcero picofino

Chloropeta gracilirostris


, 1906,

Muhokya, near Lake George, Uganda


Hitherto considered conspecific with C. bensoni (which see). Monotypic.


E DRCongo (L Edward, S of Virunga Volcanoes) and SW Uganda (lakes of Mutanda, Bunyoni, Edward and George), N & S Rwanda and N Burundi (Karuzi, Nduruma Valley, R Ruvubu along Tanzania border); also W Kenya (L Victoria).

Descriptive notes

c. 13·5 cm; 9·5–12·5 g (mention of 16·2 g in original HBW text apparently erroneous). A medium-sized olive-and-yellow warbler with long... read more


Song simple, a succession of short (0·5–0·8 seconds), rather plaintive,... read more


Primarily papyrus (Cyperus papyrus) swamp, locally also reed swamp and reedy lake edges.... read more

Food and feeding

Tiny insects. Forages at all levels in papyrus, typically over water, by hopping from stem to stem.


A female collected in early Jun in Kenya had recently laid, and a female was collected in breeding condition in May in Uganda. No other... read more



Status and conservation

VULNERABLE. Known from just three small areas in C & E Africa, with an overall Extent of Occurrence estimated at 235,000 km² and a population of 10,000–20,000... read more

Recommended citation

Pearson, D. & Kirwan, G.M. (2019). Papyrus Yellow Warbler (Calamonastides gracilirostris). 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 on 19 February 2019).