• Summary
• Text account
• Data table and detailed info
• Distribution map
• Reference and further resources

Taxonomic source(s)
del Hoyo, J., Collar, N.J., Christie, D.A., Elliott, A. and Fishpool, L.D.C. 2014. HBW and BirdLife International Illustrated Checklist of the Birds of the World. Volume 1: Non-passerines. Lynx Edicions BirdLife International, Barcelona, Spain and Cambridge, UK.
SACC. 2005 and updates. A classification of the bird species of South America. Available at: https://www.museum.lsu.edu/~Remsen/SACCBaseline.htm.

Red List criteria met

Critically Endangered	Endangered	Vulnerable
-	-	-

Red List history

Year	Category	Criteria
2023	Least Concern
2016	Near Threatened	C2a(i)
2015	Near Threatened	C2a(i)
2012	Near Threatened	C2a(i)
2008	Near Threatened	C2a(i)
2006	Near Threatened
2004	Near Threatened
2000	Lower Risk/Near Threatened
1994	Lower Risk/Near Threatened
1988	Threatened

Migratory status	not a migrant	Forest dependency	does not normally occur in forest
Land-mass type	continent	Average mass	-

	Estimate	Data quality
Extent of Occurrence (breeding/resident)	267,000 km2	medium
Severely fragmented?	no	-

	Estimate	Data quality	Derivation	Year of estimate
Population size	60000-130000 mature individuals	poor	inferred	2022
Population trend	stable	poor	suspected	-
Generation length	6.51 years	-	-	-
Number of subpopulations	2-100	-	-	-
Percentage of mature individuals in largest subpopulation	1-89%	-	-	-

Population justification: The global population is difficult to quantify, and no robust estimates of the total population exist. Previously suspected to number less than 7,000 mature individuals, this value may have been an underestimate.
In Boyacá and Santander, densities of 0.2-0.4 individuals/ha could be observed (Mendoza Mendoza and Urrego Duarte 2022). Assuming that this density is representative for the entire range, and furthermore very precautionarily assuming that only 5% of the range is occupied to account for the strict habitat requirements (i.e., 5,000 km²), the global population may number 100,000-200,000 mature individuals. This roughly equates to 60,000-130,000 mature individuals.

Trend justification: Anecdotal evidence suggests that locally the species has been disappearing from previously occupied sites (C. J. Sharpe in litt. 2015, Renjifo et al. 2016). However, based on observational records the species appears to be expanding its distribution range, presumably as a consequence of the conversion of dry shrubland to more humid open pastureland with scattered trees (Sharpe et al. 2015, eBird 2022). The rapid expansion of the distribution range is likely causing an increase in the population size, which may outweigh local declines. Tentatively, the population is therefore suspected to be stable, though the overall trend may well be increasing.

Country/Territory	Presence	Origin	Resident	Breeding visitor	Non-breeding visitor	Passage migrant
Colombia	extant	native	yes
Venezuela	extant	native	yes

Country/Territory	IBA Name
Colombia	Ciénaga de Ayapel
Colombia	Ciénaga Grande, Isla de Salamanca and Sabana Grande RAMSAR biosphere reserve
Colombia	Complejo cenagoso de la margen occidental del Río Sinú
Colombia	Complejo de Ciénagas del sur de Cesar y Bolivar
Colombia	Parque Nacional Natural Los Katíos
Colombia	Región Ecodeltáica Fluvio-Estuarina del Canal del Dique
Colombia	Reserva Natural el Garcero y alrededores
Colombia	Santuario de Fauna y Flora Los Colorados
Colombia	Serranía de San Lucas
Venezuela	Parque Nacional Ciénagas de Juan Manuel
Venezuela	Reserva de Fauna Silvestre Ciénagas de Juan Manuel, Aguas Blancas y Aguas Negras

Habitat (level 1)	Habitat (level 2)	Importance	Occurrence
Wetlands (inland)	Bogs, Marshes, Swamps, Fens, Peatlands	major	resident
Wetlands (inland)	Permanent Freshwater Lakes (over 8ha)	suitable	resident
Wetlands (inland)	Permanent Freshwater Marshes/Pools (under 8ha)	suitable	resident
Wetlands (inland)	Permanent Rivers/Streams/Creeks (includes waterfalls)	suitable	resident
Altitude	0 - 1200 m	Occasional altitudinal limits

Threat (level 1)	Threat (level 2)	Impact and Stresses
Agriculture & aquaculture	Annual & perennial non-timber crops - Small-holder farming	Timing		Scope		Severity		Impact
		Ongoing		Minority (<50%)		No decline		Low Impact: 4
		Stresses Ecosystem degradation, Ecosystem conversion
Agriculture & aquaculture	Livestock farming & ranching - Small-holder grazing, ranching or farming	Timing		Scope		Severity		Impact
		Ongoing		Minority (<50%)		No decline		Low Impact: 4
		Stresses Ecosystem degradation, Ecosystem conversion
Biological resource use	Hunting & trapping terrestrial animals - Intentional use (species is the target)	Timing		Scope		Severity		Impact
		Ongoing		Minority (<50%)		Unknown		Unknown
		Stresses Species mortality
Biological resource use	Logging & wood harvesting - Unintentional effects: (subsistence/small scale) [harvest]	Timing		Scope		Severity		Impact
		Ongoing		Minority (<50%)		No decline		Low Impact: 4
		Stresses Ecosystem degradation
Natural system modifications	Dams & water management/use - Dams (size unknown)	Timing		Scope		Severity		Impact
		Ongoing		Minority (<50%)		Negligible declines		Low Impact: 4
		Stresses Ecosystem degradation
Pollution	Domestic & urban waste water - Sewage	Timing		Scope		Severity		Impact
		Ongoing		Minority (<50%)		Negligible declines		Low Impact: 4
		Stresses Ecosystem degradation
Pollution	Industrial & military effluents - Type Unknown/Unrecorded	Timing		Scope		Severity		Impact
		Ongoing		Minority (<50%)		Negligible declines		Low Impact: 4
		Stresses Ecosystem degradation
Residential & commercial development	Housing & urban areas	Timing		Scope		Severity		Impact
		Ongoing		Minority (<50%)		No decline		Low Impact: 4
		Stresses Ecosystem conversion
Transportation & service corridors	Roads & railroads	Timing		Scope		Severity		Impact
		Past, Unlikely to Return		Minority (<50%)		No decline		Past Impact
		Stresses Ecosystem degradation
Transportation & service corridors	Utility & service lines	Timing		Scope		Severity		Impact
		Past, Unlikely to Return		Minority (<50%)		No decline		Past Impact
		Stresses Ecosystem degradation

Purpose	Scale
Food - human	subsistence, national
Pets/display animals, horticulture	subsistence, national

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Recommended citation
BirdLife International (2024) Species factsheet: Northern Screamer Chauna chavaria. Downloaded from https://datazone.birdlife.org/species/factsheet/northern-screamer-chauna-chavaria on 22/11/2024.
Recommended citation for factsheets for more than one species: BirdLife International (2024) IUCN Red List for birds. Downloaded from https://datazone.birdlife.org/species/search on 22/11/2024.