• 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., Fishpool, L.D.C., Boesman, P. and Kirwan, G.M. 2016. HBW and BirdLife International Illustrated Checklist of the Birds of the World. Volume 2: Passerines. Lynx Edicions and 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
-	-	B1ab(ii,iii,iv)

Red List history

Year	Category	Criteria
2022	Vulnerable	B1ab(ii,iii,iv)
2016	Vulnerable	A2c+3c+4c;B1ab(i,ii,iii,v)
2012	Vulnerable	A2c+3c+4c;B1ab(i,ii,iii,v)
2008	Vulnerable	A2c; A3c; A4c; B1a+b(i,ii,iii,v)
2005	Vulnerable
2004	Vulnerable
2000	Lower Risk/Near Threatened
1994	Lower Risk/Near Threatened
1988	Lower Risk/Least Concern

Migratory status	not a migrant	Forest dependency	high
Land-mass type	continent	Average mass	-

	Estimate	Data quality
Extent of Occurrence (breeding/resident)	5,650 km2	medium
Area of Occupancy (breeding/resident)	3,000 km2
Number of locations	6-10	-
Severely fragmented?	no	-

	Estimate	Data quality	Derivation	Year of estimate
Population size	19000 mature individuals	poor	inferred	2016
Population trend	decreasing	poor	suspected	2015-2027
Rate of change over the past 10 years/3 generations (longer of the two periods)	1-9%	-	-	-
Rate of change over the future 10 years/3 generations (longer of the two periods)	20-29%	-	-	-
Rate of change over the past & future 10 years/3 generations (longer of the two periods)	20-29%	-	-	-
Generation length	4.16 years	-	-	-
Number of subpopulations	2-100	-	-	-
Percentage of mature individuals in largest subpopulation	1-89%	-	-	-

Population justification: The population size or density have not been quantified directly, but the species is described as common (Greeney 2020). Based on observed densities of congeners (G. rufocinerea: 80 individuals/km²; G. milleri: 102 individuals/km²; G. urraoensis: 94 individuals/km²; Renjifo et al. 2016 and references therein) and precautionarily assuming that this species occurs at the lowest density and that one-third of suitable habitat is occupied, the population is inferred to number 28,600 individuals (Renjifo et al. 2016). This roughly equates to 19,000 mature individuals.

Trend justification: The species is suspected to decline based on ongoing habitat loss within the range (Renjifo et al. 2016). Over the past three generations (12.5 years; Bird et al. 2020), tree cover loss has been low at <2% (Global Forest Watch 2022, using Hansen et al. [2013] data and methods disclosed therein). Despite occasionally venturing into cleared, open spaces and edge habitat the species strictly depends on humid montane forests (Greeney 2020) and as such it is suspected that population declines may exceed the rate of habitat loss. The rate of past decline is here placed in the band 1-9% over three generations.
Since around 2016, tree cover loss has been accelerating (Global Forest Watch 2022), and projections of habitat loss to deforestation suggest that between 2015 and 2040 the species will lose 21% of suitable habitat (Negret et al. 2021). This equates to a rate of habitat loss of 18% over three generations. Precautionarily assuming that population declines exceed this rate by about half to account for additional impacts of forest degradation, the population may decline by 20-29% over three generations from 2015 onwards.

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

Country/Territory	IBA Name
Colombia	Cuchilla de San Lorenzo
Colombia	Valle de San Salvador
Colombia	Valle del Río Frío

Habitat (level 1)	Habitat (level 2)	Importance	Occurrence
Forest	Subtropical/Tropical Moist Montane	major	resident
Altitude	1390 - 2730 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%)		Slow, Significant Declines		Low Impact: 5
		Stresses Ecosystem degradation, Ecosystem conversion
Agriculture & aquaculture	Livestock farming & ranching - Small-holder grazing, ranching or farming	Timing		Scope		Severity		Impact
		Ongoing		Minority (<50%)		Slow, Significant Declines		Low Impact: 5
		Stresses Ecosystem degradation, Ecosystem conversion
Biological resource use	Logging & wood harvesting - Unintentional effects: (subsistence/small scale) [harvest]	Timing		Scope		Severity		Impact
		Ongoing		Majority (50-90%)		Slow, Significant Declines		Medium Impact: 6
		Stresses Ecosystem degradation, Ecosystem conversion
Natural system modifications	Fire & fire suppression - Increase in fire frequency/intensity	Timing		Scope		Severity		Impact
		Ongoing		Minority (<50%)		Slow, Significant Declines		Low Impact: 5
		Stresses Ecosystem degradation

---

Recommended citation
BirdLife International (2024) Species factsheet: Santa Marta Antpitta Grallaria bangsi. Downloaded from https://datazone.birdlife.org/species/factsheet/santa-marta-antpitta-grallaria-bangsi on 23/12/2024.
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 23/12/2024.