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CR
Raso Lark Alauda razae

IUCN Red List Criteria

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

IUCN Red List history

Year Category
2013 Critically Endangered
2012 Critically Endangered
2011 Critically Endangered
2010 Critically Endangered
2009 Critically Endangered
2008 Critically Endangered
2004 Critically Endangered
2000 Critically Endangered
1996 Endangered
1994 Endangered
1988 Threatened

Species attributes

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

Distribution

  Estimate Data quality
Extent of Occurrence breeding/resident (km2) 3 medium
Area of Occupancy breeding/resident (km2) 3 good
Number of locations 1 -
Fragmentation -

Population & trend

  Estimate Data quality Derivation Year of estimate
No. of mature individuals 250-999 good Estimated 2011
Population trend Stable good -
Number of subpopulations 1 - - -
Largest subpopulation - - -
Generation length (yrs) 6 - - -
Population justification: The population was estimated at 1,490 individuals in November 2011 (Brooke et al. 2012), which equates roughly to 990 mature individuals. However, when the population is lower 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), and the population is therefore placed in the band 250-999 mature individuals.
Trend justification: The population undergoes fluctuations due to 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 distribution

Country/Territory Occurrence status Presence Breeding Non-breeding Passage
Cape Verde Native Extant      

Important Bird Areas where this species has triggered the IBA criteria

Country/Territory IBA Name IBA link
Cape Verde Ilhéu Raso site factsheet

Habitats & altitude

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  

Threats & impact

Threat (level 1) Threat (level 2) Impact and Stresses
Climate change & severe weather Droughts Timing Scope Severity Impact
Ongoing Whole (>90%) Causing/Could cause fluct Medium Impact:
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 / Domestic Cat (Felis catus) Timing Scope Severity Impact
Future Whole (>90%) Very Rapid Declines Medium Impact:
Stresses
Reduced reproductive success, Species mortality
Invasive and other problematic species, genes & diseases Invasive non-native/alien species/diseases / Domestic Dog (Canis familiaris) Timing Scope Severity Impact
Future Whole (>90%) Very Rapid Declines Medium Impact:
Stresses
Species mortality
Invasive and other problematic species, genes & diseases Invasive non-native/alien species/diseases / Unspecified rats (Rattus spp.) Timing Scope Severity Impact
Future Whole (>90%) Very Rapid Declines Medium Impact:
Stresses
Reduced reproductive success

Recommended citation
BirdLife International (2014) Species factsheet: Alauda razae. Downloaded from http://www.birdlife.org on 22/07/2014. Recommended citation for factsheets for more than one species: BirdLife International (2014) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 22/07/2014.

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 Critically Endangered
Family Alaudidae (Larks)
Species name author (Alexander, 1898)
Population size 250-999 mature individuals
Population trend Stable
Distribution size (breeding/resident) 3 km2
Country endemic? Yes
Links to further information
- Summary information on this species