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

Taxonomic source(s)
AERC TAC. 2003. AERC TAC Checklist of bird taxa occurring in Western Palearctic region, 15th Draft. Available at: http://www.aerc.eu/DOCS/Bird_taxa_of_the_WP15.xls.
Cramp, S. and Simmons, K.E.L. (eds). 1977-1994. Handbook of the birds of Europe, the Middle East and Africa. The birds of the western Palearctic. Oxford University Press, Oxford.
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.

Red List criteria met

Critically Endangered	Endangered	Vulnerable
B1ac(iv)	B1ac(iv)+2ac(iv)	B1ac(iv)+2ac(iv); D1+2

Red List history

Year	Category	Criteria
2021	Critically Endangered	B1ac(iv)
2018	Critically Endangered	B1ac(iv)+2ac(iv)
2016	Critically Endangered	B1ac(iv)+2ac(iv)
2013	Critically Endangered	B1ac(iv)+2ac(iv)
2012	Critically Endangered	B1ac(iv)+2ac(iv)
2011	Critically Endangered	B1a+c(iv); B2a+c(iv)
2010	Critically Endangered	B1a+c(iv); B2a+c(iv)
2009	Critically Endangered	B1a+c(iv); B2a+c(iv)
2008	Critically Endangered
2004	Critically Endangered
2000	Critically Endangered
1996	Endangered
1994	Endangered
1988	Threatened

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

	Estimate	Data quality
Extent of Occurrence (breeding/resident)	4 km2	medium
Area of Occupancy (breeding/resident)	16 km2	good
Number of locations	1	-
Severely fragmented?	no	-

	Estimate	Data quality	Derivation	Year of estimate
Population size	250-999 mature individuals	good	estimated	2015
Population trend	stable	good	estimated	-
Generation length	3.1 years	-	-	-
Number of subpopulations	1	-	-	-
Percentage of mature individuals in largest subpopulation	100%	-	-	-

Population justification: The population was estimated at 1,558 individuals in November 2011, before it declined to 855 in November 2015 (M. Brooke in litt. 2016). This equates roughly to 570 mature individuals. However, when the population is smaller it can be strongly male-biased, meaning the effective population size is smaller than it first appears (M. Brooke in litt. 2008, 2010, Brooke et al. 2010). Therefore, the population is placed in the band 250-999 mature individuals.

Trend justification: The population undergoes fluctuations due to varying rainfall levels on Raso (Donald et al. 2003, Donald and Brooke 2006, Brooke et al. 2012). It has increased rapidly since 2004, but it is uncertain whether this relates to a temporary fluctuation or a longer-term increase.

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

Country/Territory	IBA Name
Cape Verde	Raso Islet Integral Natural Reserve

Habitat (level 1)	Habitat (level 2)	Importance	Occurrence
Grassland	Subtropical/Tropical Dry	suitable	resident
Marine Intertidal	Tidepools	marginal	resident
Shrubland	Subtropical/Tropical Dry	major	resident
Wetlands (inland)	Seasonal/Intermittent/Irregular Rivers/Streams/Creeks	major	resident
Altitude	0 - 50 m	Occasional altitudinal limits

Threat (level 1)	Threat (level 2)	Impact and Stresses
Climate change & severe weather	Droughts	Timing		Scope		Severity		Impact
		Ongoing		Whole (>90%)		Causing/Could cause fluctuations		Medium Impact: 7
		Stresses Ecosystem degradation, Species mortality
Climate change & severe weather	Habitat shifting & alteration	Timing		Scope		Severity		Impact
		Future		Whole (>90%)		Unknown		Unknown
		Stresses Indirect ecosystem effects, Ecosystem degradation
Invasive and other problematic species, genes & diseases	Invasive non-native/alien species/diseases - Canis familiaris	Timing		Scope		Severity		Impact
		Future		Whole (>90%)		Very Rapid Declines		Medium Impact: 7
		Stresses Species mortality
Invasive and other problematic species, genes & diseases	Invasive non-native/alien species/diseases - Felis catus	Timing		Scope		Severity		Impact
		Future		Whole (>90%)		Very Rapid Declines		Medium Impact: 7
		Stresses Reduced reproductive success, Species mortality
Invasive and other problematic species, genes & diseases	Invasive non-native/alien species/diseases - Named species	Timing		Scope		Severity		Impact
		Future		Whole (>90%)		Very Rapid Declines		Medium Impact: 7
		Stresses Reduced reproductive success
Invasive and other problematic species, genes & diseases	Invasive non-native/alien species/diseases - Unspecified species	Timing		Scope		Severity		Impact
		Future		Whole (>90%)		Unknown		Unknown
		Stresses Ecosystem degradation
Invasive and other problematic species, genes & diseases	Problematic native species/diseases - Tarentola gigas	Timing		Scope		Severity		Impact
		Ongoing		Whole (>90%)		Very Rapid Declines		High Impact: 9
		Stresses Reduced reproductive success

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Recommended citation
BirdLife International (2024) Species factsheet: Raso Lark Alauda razae. Downloaded from https://datazone.birdlife.org/species/factsheet/raso-lark-alauda-razae 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.