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VU
Sumba Hornbill Aceros everetti

IUCN Red List Criteria

Critically Endangered  
Endangered  
Vulnerable A2cd+3cd+4cd;B1ab(ii,iii,iv,v);C1+2a(ii) 

IUCN Red List history

Year Category
2012 Vulnerable
2010 Vulnerable
2008 Vulnerable
2004 Vulnerable
2000 Vulnerable
1996 Vulnerable
1994 Vulnerable
1988 Threatened

Species attributes

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

Distribution

  Estimate Data quality
Extent of Occurrence breeding/resident (km2) 10,700 medium
Number of locations 11-100 -
Fragmentation -

Population & trend

  Estimate Data quality Derivation Year of estimate
No. of mature individuals 2500-9999 medium Estimated 2009
Population trend Decreasing poor -
Number of subpopulations 1 - - -
Largest subpopulation 2500-9999 - - -
Generation length (yrs) 19 - - -
Population justification: Recent population estimates are difficult to reconcile, ranging from 1,650 mature individuals on the whole of Sumba, to 6,400 individuals in the Manupeu-Tanadaru National Park alone (D. Mulyawati in litt. 2010, T. O'Brien in litt. 2010), although another estimate of fewer than 4,000 individuals in total has been given (Burung Indonesia in litt. 2011). A population size of 2,500-9,999 mature individuals is retained here until the differences between these estimates are accounted for.
Trend justification: Despite the adequate protection of an area of lowland forest in the Manupeu-Tanadaru National Park (D. Mulyawati in litt. 2010), an overall population decline of 30-49% is estimated owing to the extensive and on-going loss and fragmentation of forest habitats outside of the reserve.

Country/Territory distribution

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

Important Bird Areas where this species has triggered the IBA criteria

Country/Territory IBA Name IBA link
Indonesia Laiwanggi-Wanggameti site factsheet
Indonesia Luku Melolo site factsheet
Indonesia Manupeu-Tanadaru site factsheet
Indonesia Poronumbu site factsheet
Indonesia Tanjung Ngunju (Pangaduhahar) site factsheet
Indonesia Yawila site factsheet

Habitats & altitude

Habitat (level 1) Habitat (level 2) Importance Occurrence
Forest Subtropical/Tropical Moist Lowland major resident
Savanna Dry suitable resident
Altitude 0 - 950 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 Minority (<50%) Slow, Significant Decline Low Impact: 5
Stresses
Ecosystem degradation, Ecosystem conversion
Agriculture & aquaculture Annual & perennial non-timber crops / Small-holder farming Timing Scope Severity Impact
Ongoing Minority (<50%) Slow, Significant Decline 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 Decline 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 Decline Low Impact: 5
Stresses
Ecosystem degradation, Ecosystem conversion
Biological resource use Hunting & trapping terrestrial animals / Intentional use (species is the target) Timing Scope Severity Impact
Past, Unlikely to Return Minority (<50%) Slow, Significant Decline Past Impact
Stresses
Species mortality
Biological resource use Hunting & trapping terrestrial animals / Intentional use (species is the target) Timing Scope Severity Impact
Past, Unlikely to Return Minority (<50%) Slow, Significant Decline Past Impact
Stresses
Species mortality
Biological resource use Logging & wood harvesting / Unintentional effects: (subsistence/small scale) [harvest] Timing Scope Severity Impact
Ongoing Minority (<50%) Slow, Significant Decline Low Impact: 5
Stresses
Ecosystem degradation
Biological resource use Logging & wood harvesting / Unintentional effects: (subsistence/small scale) [harvest] Timing Scope Severity Impact
Ongoing Minority (<50%) Slow, Significant Decline Low Impact: 5
Stresses
Ecosystem degradation
Climate change & severe weather Storms & flooding Timing Scope Severity Impact
Future Whole (>90%) Unknown Unknown
Stresses
Ecosystem degradation, Species mortality
Climate change & severe weather Storms & flooding Timing Scope Severity Impact
Future Whole (>90%) Unknown Unknown
Stresses
Ecosystem degradation, Species mortality
Invasive and other problematic species, genes & diseases Invasive non-native/alien species/diseases / Domestic Cow (Bos taurus) Timing Scope Severity Impact
Ongoing Whole (>90%) Negligible declines Medium Impact:
Stresses
Ecosystem degradation

Utilisation

Purpose Primary form used Life stage used Source Scale Level Timing
Pets Whole Adults and juveniles Wild Subsistence, National Non-trivial Recent
Food (human) Whole Adults and juveniles Wild Subsistence, National Non-trivial Recent
Pets Whole Adults and juveniles Wild International Non-trivial Recent

Recommended citation
BirdLife International (2014) Species factsheet: Aceros everetti. Downloaded from http://www.birdlife.org on 18/04/2014. Recommended citation for factsheets for more than one species: BirdLife International (2014) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 18/04/2014.

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 Vulnerable
Family Bucerotidae (Hornbills)
Species name author Rothschild, 1897
Population size 2500-9999 mature individuals
Population trend Decreasing
Distribution size (breeding/resident) 10,700 km2
Country endemic? Yes
Links to further information
- Summary information on this species