Family Tyrant-flycatchers (Tyrannidae)

Least Concern

Northern Bentbill (Oncostoma cinereigulare)


French: Bec-en-arc cendré German: Graukehl-Krummschnabeltyrann Spanish: Mosquerito piquicurvo norteño

Todirostrum cinereigulare

P. L. Sclater

, 1857,

Córdoba, Veracruz, Mexico


Sometimes considered conspecific with O. olivaceum (which see). One specimen from NW Antioquia (NW Colombia), identified as belonging to present species on basis of yellow underparts, may represent disjunct population, separated from nearest neighbour in W Panama by 400–600 km; slight variation in belly colour of present species has led to questions about identity of specimen, but recent examination appears to confirm identification. Monotypic.


S Mexico (S Veracruz, N Oaxaca) S to W Panama (Caribbean slope E to W Colón and Pacific slope in W Chiriquí); probable specimen record from NW Colombia (NW Antioquia).

Descriptive notes

9·5–10·5 cm; 4·5–7 g. Distinctive bill with significant downward curve. Has grey crown contrasting strongly with olive upperparts; wings dusky with lemon-yellow... read more


Guttural insect-like or toad-like trill, “grrrr” or “chiurr­rrrrrr”, sometimes with... read more


Thickets and dense undergrowth of humid lowland forest, forest edge, tropical deciduous forest, and... read more

Food and feeding

Arthropods; occasionally eats small berries. Stomach contents in Costa Rica included 98 items, of which beetles (Coleoptera) 33%, arachnids... read more


Birds in breeding condition in early Apr in El Salvador. Nest, built by female, roundish, vertically elongated, domed, with side entrance,... read more



Status and conservation

Not globally threatened. Uncommon to common. Occurs in several national parks and other protected areas throughout its reasonably large range. Fairly adaptable; tolerates... read more

Recommended citation

Clock, B. (2019). Northern Bentbill (Oncostoma cinereigulare). 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 8 December 2019).