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Large-billed Seed-finch Oryzoborus crassirostris
BirdLife is updating this factsheet for the 2016 Red List
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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.

Taxonomic source(s)
SACC. 2006. A classification of the bird species of South America. Available at: #

Distribution and population
This species occurs in north and east Colombia (in humid Caribbean lowlands west to Córdoba and locally east of the Andes), where it may be expanding its range following deforestation (Stiles et al. 1999), Venezuela (not recorded from the north-west or from most of the llanos region), Guyana, Suriname, French Guiana, Amazonian Brazil (south only to the Amazon), and north-east Peru (Loreto to Huánuco); it may persist in small numbers on Trinidad, Trinidad and Tobago (ffrench 1992, Ridgely and Tudor 1989).

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 11.3-11.5% of suitable habitat within its distribution over three generations (11 years) based on a model of Amazonian deforestation (Soares-Filho et al. 2006, Bird et al. 2011). It is therefore suspected to decline by <25% over three generations.

The species inhabits freshwater marshes, riparian thickets and second-growth scrub, mostly below 500 m but it has been recorded to 700 m (Ridgely and Tudor 1989, Stotz et al. 1996).

The principal threat is the depletion of local populations by bird trappers (Ridgely and Tudor 1989, R. Clay in litt. 2010, C. J. Sharpe in litt. 2011), although this is not considered a threat in Colombia (F. G. Stiles in litt. 1999).

Ridgely, R. S.; Tudor, G. 1989. The birds of South America. University of Texas Press, Austin, Texas.

Stiles, F. G.; Rosselli, L.; Bohórquez, C. I. 1999. New and noteworthy records of birds from the middle Magdalena valley of Colombia. Bulletin of the British Ornithologists' Club 119: 113-129.

Stotz, D. F.; Fitzpatrick, J. W.; Parker, T. A.; Moskovits, D. K. 1996. Neotropical birds: ecology and conservation. University of Chicago Press, Chicago.

Further web sources of information
Explore HBW Alive for further information on this species

Search for photos and videos, and hear sounds of this species from the Internet Bird Collection

Text account compilers
Butchart, S., Ekstrom, J., Fisher, S., Harding, M., Sharpe, C J

Acevedo , O., Bayly, N., Sharpe, C J, De Luca, A., Clay, R.

IUCN Red List evaluators
Butchart, S., Symes, A.

Recommended citation
BirdLife International (2016) Species factsheet: Oryzoborus crassirostris. Downloaded from on 23/10/2016. Recommended citation for factsheets for more than one species: BirdLife International (2016) IUCN Red List for birds. Downloaded from on 23/10/2016.

This information is based upon, and updates, the information published in BirdLife International (2000) Threatened birds of the world. Barcelona and Cambridge, UK: Lynx Edicions and BirdLife International, BirdLife International (2004) Threatened birds of the world 2004 CD-ROM and BirdLife International (2008) Threatened birds of the world 2008 CD-ROM. These sources provide the information for species accounts for the birds on the IUCN Red List.

To provide new information to update this factsheet or to correct any errors, please email BirdLife

To contribute to discussions on the evaluation of the IUCN Red List status of Globally Threatened Birds, please visit BirdLife's Globally Threatened Bird Forums.

Key facts
Current IUCN Red List category Least Concern
Family Emberizidae (Buntings, American sparrows and allies)
Species name author (Gmelin, 1789)
Population size Unknown mature individuals
Population trend Decreasing
Distribution size (breeding/resident) 2,530,000 km2
Country endemic? No
Links to further information
- Additional Information on this species