Ninox sumbaensis 


Taxonomy [top]

Kingdom Phylum Class Order Family
Animalia Chordata Aves Strigiformes Strigidae

Scientific Name: Ninox sumbaensis
Species Authority: Olsen, Wink, Sauer-Gurth & Trost, 2002
Common Name(s):
English Least Boobook
Taxonomic Source(s): del Hoyo, J., Collar, N.J., Christie, D.A., Elliott, A. and Fishpool, L.D.C. 2014. HBW and BirdLife International Illustrated Checklist of the Birds of the World. Lynx Edicions BirdLife International.
Taxonomic Notes: Described as new to science by Olsen et al. (2002).

Assessment Information [top]

Red List Category & Criteria: Near Threatened ver 3.1
Year Published: 2012
Date Assessed: 2012-05-01
Assessor(s): BirdLife International
Reviewer(s): Butchart, S. & Symes, A.
Contributor(s): Benstead, P. & Crosby, M.
Facilitator/Compiler(s): Benstead, P., Bird, J., Khwaja, N., Taylor, J.
This poorly known species is listed as Near Threatened because it is thought to have a moderately small population which has almost certainly declined through forest clearance within its range. Further research is a priority for improving this assessment of its status.

Previously published Red List assessments:
2008 Near Threatened (NT)
2004 Near Threatened (NT)
2000 Not Recognized (NR)
1994 Not Recognized (NR)
1988 Not Recognized (NR)

Geographic Range [top]

Range Description: Ninox sumbaensis was formally described only recently, although the taxon has been known to ornithologists since the late 1980s (Olsen et al. 2002). It is currently very poorly known and has only been recorded from three localities on Sumba, Indonesia (Linsley et al. 1998, Olsen et al. 2002, Benstead and Benstead in prep.).

Countries occurrence:
Continuing decline in area of occupancy (AOO): Unknown
Extreme fluctuations in area of occupancy (AOO): No
Estimated extent of occurrence (EOO) - km2: 2900
Continuing decline in extent of occurrence (EOO): Unknown
Extreme fluctuations in extent of occurrence (EOO): No
Number of Locations: 2-5
Continuing decline in number of locations: Unknown
Extreme fluctuations in the number of locations: No
Lower elevation limit (metres): 600
Upper elevation limit (metres): 950
Range Map: Click here to open the map viewer and explore range.

Population [top]

Population: This species is very poorly known but it is thought to be uncommon given that it escaped detection for many years and there are few records available. It is placed in the band 10,000-19,999 mature individuals, equating to 15,000-29,999 individuals in total, rounded here to 15,000-30,000 individuals. This preliminary population estimate requires clarification.

Trend Justification:  The population is suspected to be in decline owing to on-going habitat destruction.
Current Population Trend: Decreasing
Additional data:
Number of mature individuals: 10000-19999 Continuing decline of mature individuals: Unknown
Extreme fluctuations: No Population severely fragmented: No
No. of subpopulations: 1 Continuing decline in subpopulations: Unknown
Extreme fluctuations in subpopulations: No All individuals in one subpopulation: Yes
No. of individuals in largest subpopulation: 100

Habitat and Ecology [top]

Habitat and Ecology: It appears to be limited to small patches of primary, disturbed primary, secondary and degraded forest at 600-950 m on Sumba. Young offspring have been observed in November (Olsen et al. 2009).

Systems: Terrestrial
Continuing decline in area, extent and/or quality of habitat: Unknown
Generation Length (years): 4.1
Movement patterns: Not a Migrant

Threats [top]

Major Threat(s): It is undoubtedly at some risk from on-going habitat loss owing to logging and agricultural expansion.

Conservation Actions [top]

Conservation Actions: Conservation Actions Underway
None are known.

Conservation Actions Proposed
Survey work is required to ascertain the distribution and status of this poorly known owl. As a precaution, protect significant areas of suitable forest, in both strictly protected areas and community-led multiple use areas.

Citation: BirdLife International. 2012. Ninox sumbaensis. The IUCN Red List of Threatened Species 2012: e.T22730062A40414418. . Downloaded on 30 November 2015.
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