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.
Critically Endangered | Endangered | Vulnerable |
---|---|---|
- | - | - |
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 |
Migratory status | not a migrant | Forest dependency | high |
Land-mass type | Average mass | - |
Estimate | Data quality | |
---|---|---|
Extent of Occurrence (breeding/resident) | 10,900 km2 | medium |
Severely fragmented? | no | - |
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 | Presence | Origin | Resident | Breeding visitor | Non-breeding visitor | Passage migrant |
---|---|---|---|---|---|---|
Indonesia | extant | native | yes |
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 |
Habitat (level 1) | Habitat (level 2) | Importance | Occurrence |
---|---|---|---|
Forest | Subtropical/Tropical Moist Lowland | major | resident |
Altitude | 0 - 1000 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 | Majority (50-90%) | Slow, Significant Declines | Medium Impact: 6 | ||||||
|
|||||||||
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 | ||||||
|
|||||||||
Invasive and other problematic species, genes & diseases | Problematic native species/diseases | Timing | Scope | Severity | Impact | ||||
Ongoing | Minority (<50%) | Negligible declines | Low Impact: 4 | ||||||
|
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.