NT
Flores Crow Corvus florensis



Taxonomy

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.

IUCN Red List criteria met and history
Red List criteria met
Critically Endangered Endangered Vulnerable
- - -

Red List history
Year Category Criteria
2024 Near Threatened B1b(iii)
2016 Endangered C2a(ii)
2012 Endangered C2a(ii)
2008 Endangered C2a(ii)
2004 Endangered
2000 Endangered
1996 Vulnerable
1994 Vulnerable
1988 Threatened
Species attributes

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

Estimate Data quality
Extent of Occurrence (breeding/resident) 10,900 km2 medium
Severely fragmented? no -
Population
Estimate Data quality Derivation Year of estimate
Population size unknown poor - -
Population trend decreasing poor suspected 2005-2027
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) 1-9% - - -
Rate of change over the past & future 10 years/3 generations (longer of the two periods) 1-9% - - -
Generation length 5.64 years - - -
Number of subpopulations 1 - - -
Percentage of mature individuals in largest subpopulation 100% - - -

Population justification: The population size has not been quantified but the species is described as uncommon in forest (Eaton et al. 2021). A lack of population data are available to give an accurate estimation of population size, however it is unlikely to be especially large due to its small range where it is found at low densities. However, records on eBird (2024) indicate that the species is regularly encountered at sites with good survey effort.

Trend justification: Corvus florensis inhabits forested areas in western Flores. With its reliance on forested areas it is probable that population declines are in line with rates of habitat loss. It is thought to be intolerant of total forest clearance, however it can tolerate forest degradation (Butchart et al. 1996). In the three generations (17 years) to 2023, tree cover in this species’ range declined by 3% (Global Forest Watch (2024) based on data from Hansen et al. (2013) and methods therein). Precautionarily, similar rates are suspected to occur in the future three generations. Because of this, the species is suspected to be declining at an ongoing rate of 1-9%.


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

Important Bird and Biodiversity Areas (IBA)
Country/Territory IBA Name
Indonesia Komodo - Rinca
Indonesia Mausambi
Indonesia Mbeliling - Tanjung Kerita Mese
Indonesia Nangarawa
Indonesia Nggorang Bowosie
Indonesia Sesok
Indonesia Todo Repok
Indonesia Wae Wuul
Indonesia Wolo Tado

Habitats & altitude
Habitat (level 1) Habitat (level 2) Importance Occurrence
Forest Subtropical/Tropical Moist Lowland major resident
Altitude 0 - 1000 m Occasional altitudinal limits  

Threats & impact
Threat (level 1) Threat (level 2) Impact and Stresses
Agriculture & aquaculture Annual & perennial non-timber crops - Small-holder farming Timing Scope Severity Impact
Ongoing Majority (50-90%) Slow, Significant Declines Medium Impact: 6
Stresses
Ecosystem degradation, Ecosystem conversion
Biological resource use Logging & wood harvesting - Unintentional effects: (subsistence/small scale) [harvest] Timing Scope Severity Impact
Ongoing Minority (<50%) Slow, Significant Declines Low Impact: 5
Stresses
Ecosystem degradation
Invasive and other problematic species, genes & diseases Problematic native species/diseases Timing Scope Severity Impact
Ongoing Minority (<50%) Negligible declines Low Impact: 4
Stresses
Competition

Recommended citation
BirdLife International (2024) Species factsheet: Flores Crow Corvus florensis. Downloaded from https://datazone.birdlife.org/species/factsheet/flores-crow-corvus-florensis 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.