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, Barcelona, Spain and Cambridge, UK.
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.
Critically Endangered | Endangered | Vulnerable |
---|---|---|
- | B1ab(ii,iii,v); C2a(i); D | B1ab(ii,iii,v); C2a(i); D1 |
Year | Category | Criteria |
---|---|---|
2016 | Endangered | B1ab(ii,iii,v); C2a(i); D |
2012 | Endangered | B1ab(ii,iii,v);C2a(i) |
2008 | Endangered | B1a+b(ii,iii); C2a(i) |
2006 | Endangered | |
2004 | Not Recognised | |
2000 | Not Recognised | |
1994 | Not Recognised | |
1988 | Not Recognised |
Migratory status | not a migrant | Forest dependency | high |
Land-mass type | Average mass | - |
Estimate | Data quality | |
---|---|---|
Extent of Occurrence (breeding/resident) | 1,500 km2 | medium |
Number of locations | 5 | - |
Severely fragmented? | yes | - |
Estimate | Data quality | Derivation | Year of estimate | |
---|---|---|---|---|
Population size | 150-700 mature individuals | poor | estimated | 2007 |
Population trend | decreasing | poor | suspected | - |
Generation length | 3.7 years | - | - | - |
Number of subpopulations | 2-100 | - | - | - |
Percentage of mature individuals in largest subpopulation | 1-89% | - | - | - |
Population justification: Extensive surveys have located 100 individuals and led to a global population estimate of 200-250 individuals. However, given the species's elusive nature and its ability to remain undiscovered for so long the true population size is likely to be somewhat higher. Therefore, it is probably best placed in the band 250-999 individuals. This equates to 167-666 mature individuals, rounded to 150-700 mature individuals here.
Trend justification: The species appears to be intolerant of habitat loss and severe fragmentation, and so is suspected to be declining as the very few remaining unprotected areas of forest are slowly lost. The likely rate of population decline has not been estimated.
Country/Territory | Presence | Origin | Resident | Breeding visitor | Non-breeding visitor | Passage migrant |
---|---|---|---|---|---|---|
Sri Lanka | extant | native | yes |
Country/Territory | IBA Name |
---|
Habitat (level 1) | Habitat (level 2) | Importance | Occurrence |
---|---|---|---|
Forest | Subtropical/Tropical Moist Lowland | major | resident |
Altitude | 30 - 530 m | Occasional altitudinal limits |
Threat (level 1) | Threat (level 2) | Impact and Stresses | |||||||
---|---|---|---|---|---|---|---|---|---|
Agriculture & aquaculture | Annual & perennial non-timber crops - Scale Unknown/Unrecorded | Timing | Scope | Severity | Impact | ||||
Ongoing | Minority (<50%) | Rapid Declines | Medium Impact: 6 | ||||||
|
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Biological resource use | Logging & wood harvesting - Unintentional effects: (subsistence/small scale) [harvest] | Timing | Scope | Severity | Impact | ||||
Ongoing | Minority (<50%) | Rapid Declines | Medium Impact: 6 | ||||||
|
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Energy production & mining | Mining & quarrying | Timing | Scope | Severity | Impact | ||||
Ongoing | Minority (<50%) | Slow, Significant Declines | Low Impact: 5 | ||||||
|
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Residential & commercial development | Housing & urban areas | Timing | Scope | Severity | Impact | ||||
Ongoing | Minority (<50%) | Slow, Significant Declines | Low Impact: 5 | ||||||
|
Recommended citation
BirdLife International (2024) Species factsheet: Serendib Scops-owl Otus thilohoffmanni. Downloaded from
https://datazone.birdlife.org/species/factsheet/serendib-scops-owl-otus-thilohoffmanni on 03/12/2024.
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 03/12/2024.