Curve-billed Scythebill Campylorhamphus procurvoides


Justification of Red List Category
This species has an extremely large range, and hence does not approach the thresholds for Vulnerable under the range size criterion (Extent of Occurrence <20,000 km2 combined with a declining or fluctuating range size, habitat extent/quality, or population size and a small number of locations or severe fragmentation). Despite the fact that the population trend appears to be decreasing, the decline is not believed to be sufficiently rapid to approach the thresholds for Vulnerable under the population trend criterion (>30% decline over ten years or three generations). The population size has not been quantified, but it is not believed to approach the thresholds for Vulnerable under the population size criterion (<10,000 mature individuals with a continuing decline estimated to be >10% in ten years or three generations, or with a specified population structure). For these reasons the species is evaluated as Least Concern.

Population justification
The global population size has not been quantified, but this species is described as 'uncommon and patchily distributed' (Stotz et al. 1996).

Trend justification
This species is suspected to lose 8.5-9.5% of suitable habitat within its distribution over three generations (12 years) based on a model of Amazonian deforestation (Soares-Filho et al. 2006, Bird et al. 2011). Given the susceptibility of the species to fragmentation and/or edge effects, it is therefore suspected to decline by <25% over three generations.

Distribution and population

This species's range extends from southeastern Colombia through northeastern Ecuador and extreme northeastern Peru to northern Brazil, southern and eastern Venezuela, northern Guyana, Suriname and French Guiana.


Inhabits humid evergreen forest. Largely restricted to terra firme forest, only occasionally entering floodplain-forest; even along rivers and on islands apparently restricted to dry ground and not in flooded forest, being replaced in latter by C. trochilirostris. In some parts of range (especially in southern Amazonia) closely associated with bamboo thickets or forests rich in vine tangles, where ecological separation less clear. Generally in interior of mature forest or dense thickets of bamboo, but sometimes visits forest edge. Tropical lowlands, primarily below 500 m, but reaching 700 m in southern Suriname and sight record at 900 m in eastern Venezuela.


Text account compilers
Butchart, S., Derhé, M. & Ekstrom, J.

Recommended citation
BirdLife International (2022) Species factsheet: Campylorhamphus procurvoides. Downloaded from on 06/12/2022. Recommended citation for factsheets for more than one species: BirdLife International (2022) IUCN Red List for birds. Downloaded from on 06/12/2022.