Ninox rudolfi


Taxonomy [top]

Kingdom Phylum Class Order Family

Scientific Name: Ninox rudolfi
Species Authority: Meyer, 1882
Common Name(s):
English Sumba Boobook
Spanish Nínox de Sumba

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.
Facilitator/Compiler(s): Benstead, P., Bird, J., Khwaja, N., Taylor, J.
This species may have a small to moderately small population within its small range, and numbers are declining owing to on-going forest conversion. However, the range is not yet severely fragmented or restricted to few locations, thus the species is classified as Near Threatened.

Geographic Range [top]

Range Description: Ninox rudolfi is restricted to Sumba, Indonesia. Although characterised as uncommon or rare, recent observations have revealed that the species is widespread and moderately common on Sumba, despite forest cover being reduced to just 10% on the island.

Range Map: Click here to open the map viewer and explore range.

Population [top]

Population: The species was reportedly relatively common and widespread in 1998, but may have declined since. Hence, the current population estimate of 10,000-19,999 individuals is very preliminary and requires clarification. This estimate equates to 6,667-13,333 mature individuals, rounded here to 6,000-15,000 mature individuals.
Population Trend: Decreasing

Habitat and Ecology [top]

Habitat and Ecology: It occurs up to 1,000 m in primary, disturbed primary and secondary forest and forest edge, in both deciduous and evergreen formations, and mangroves (Olsen et al. 2009). It is typically found occurring singly, in pairs or small dispersed groups of up to four birds. Its diet is not known but probably consists mainly of insects.

Systems: Terrestrial

Threats [top]

Major Threat(s): Forest cover is threatened by extensive clearing and repeated burning for grazing and agriculture.

Conservation Actions [top]

Conservation Actions: Conservation Actions Underway
CITES Appendix II.

Conservation Actions Proposed
Clarify the species's abundance outside of forest habitats and generate a global population estimate. Determine the impact of forest clearance on the population. 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 rudolfi. The IUCN Red List of Threatened Species. Version 2015.2. <>. Downloaded on 29 August 2015.
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