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Minahassa Masked-owl Tyto inexspectata
BirdLife is updating this factsheet for the 2016 Red List
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Given the continuing habitat destruction and degradation taking place in its range, the apparently small population of this elusive owl is likely to be declining and fragmented. As a result, it qualifies as Vulnerable.

Taxonomic source(s)
del Hoyo, J.; Collar, N. J.; Christie, D. A.; Elliott, A.; Fishpool, L. D. C. 2014. HBW and BirdLife International Illustrated Checklist of the Birds of the World. Barcelona, Spain and Cambridge UK: Lynx Edicions and BirdLife International.

30 cm. Medium-small, forest-dwelling owl. Light rusty facial disk. Rusty upperparts speckled black, rusty-cream underparts spotted black, wings barred black and rufous. Finely barred tail. Nuchal area and bend of wing darker than rest of plumage. Black iris. Similar spp. Sulawesi Owl T. rosenbergi is much larger, with dusky facial disc and upperparts finely spotted white. There are two morphs of this species, of which the darker is most difficult to differentiate from T. rosenbergi. Voice Single nasal, hoarse, hissing shriek lasting about 1.8 seconds and delivered infrequently every 5-7 minutes (Mauro and Drijvers 2000).

Distribution and population
Tyto inexspectata is endemic to Sulawesi, Indonesia, where it is known from 11 specimens collected on the Minahasa peninsula and north-central regions of the island, and a few subsequent records (BirdLife International 2001). A number of recent records have come from Tangkoko National Park (F. Verbelen in litt. 2012). It appears to be sparsely distributed, and has been described as very uncommon or rare. However, it is shy, easily overlooked, and consequently almost certainly more abundant than records suggest. Numbers are likely to have declined steadily in line with on-going habitat loss.

Population justification
The population is estimated to number 2,500-9,999 mature individuals based on an assessment of known records, descriptions of abundance and range size. This is consistent with recorded population density estimates for congeners or close relatives with a similar body size; its description as being uncommon or rare, and the fact that only a proportion of the estimated Extent of Occurrence is likely to be occupied. This estimate is equivalent to 3,750-14,999 individuals in total, rounded here to 3,500-15,000 individuals.

Trend justification
Forest loss below 1,000 m on the Minahas peninsula has been near total and continues in other parts of the species's range. As a result it is suspected to be declining at a moderate rate.

It inhabits primary and lightly disturbed rainforest, rich with lianas, ferns, palms and epiphytic plants, and also, at least occasionally, disturbed riverine forest and forest edge, from 100 m to 1,600 m. It is presumably sedentary.

The loss, degradation and fragmentation of forests pose the major threat to the species. It has doubtless contracted in range in the lowlands of Sulawesi, particularly on the Minahasa peninsula, as a result of land clearance for transmigration settlements, agricultural and infrastructural development and large-scale logging. Destruction of lowland forest on the Minahasa peninsula is described as "almost complete", and most primary forest below 1,000 m has been reduced to remnant patches, supplanted by secondary, disturbed and commercially utilised forest. Recent records of the species from higher altitudes provide some hope that healthy populations survive in more secure montane forests. In Indonesia, new regional autonomy laws were passed in 1999 (and enacted in early 2000); these empower regional governments to determine the licensing of forest concessions and exploitation of natural resources. Unfortunately there has been a significant increase in the amount of logging taking place in protected areas since decentralisation, especially in Sulawesi.

Conservation Actions Underway
CITES Appendix II. It is known to occur in two protected areas, Bogani Nani Wartabone and Lore Lindu National Parks, which have been described as "two of the largest, biologically most important and best administered parks in Wallacea". In addition, 21 protected areas, with a total area of c.9,000 km2, have been proposed and/or established within the known range of the species. Conservation Actions Proposed
Conduct widespread searches for the species in suitable habitat (using playback of its vocalisations if available), to clarify its range, distribution and population status. Reassess its conservation needs following these surveys, recommending further areas for protection where appropriate. Lobby for reduced logging of lower altitude forest in Sulawesi.

BirdLife International. 2001. Threatened birds of Asia: the BirdLife International Red Data Book. BirdLife International, Cambridge, U.K.

Mauro, I.; Drijvers, R. 2000. Minahassa Owl Tyto inexspectata at Lore Lindu National Park, Sulawesi, Indonesia in December 1998. Forktail 16: 180-182.

Further web sources of information
Detailed species accounts from the Threatened birds of Asia: the BirdLife International Red Data Book (BirdLife International 2001).

Explore HBW Alive for further information on this species

Search for photos and videos, and hear sounds of this species from the Internet Bird Collection

Text account compilers
Benstead, P., Bird, J., Taylor, J., Tobias, J., Allinson, T

Verbelen, F., Bishop, K.

IUCN Red List evaluators
Butchart, S., Symes, A.

Recommended citation
BirdLife International (2016) Species factsheet: Tyto inexspectata. Downloaded from on 27/10/2016. Recommended citation for factsheets for more than one species: BirdLife International (2016) IUCN Red List for birds. Downloaded from on 27/10/2016.

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.

Additional resources for this species

ARKive species - Sulawesi golden owl (Tyto inexspectata) 0

Key facts
Current IUCN Red List category Vulnerable
Family Tytonidae (Barn-owls)
Species name author (Schlegel, 1879)
Population size 2500-9999 mature individuals
Population trend Decreasing
Distribution size (breeding/resident) 47,300 km2
Country endemic? Yes
Links to further information
- Additional Information on this species