Data Zone
Taxonomic note
Glaucidium castanotum (del Hoyo and Collar 2014) was previously listed as G. castanonotum.
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 |
|---|---|---|
| - | - | - |
| Year | Category | Criteria |
|---|---|---|
| 2016 | Near Threatened | C1 |
| 2013 | Near Threatened | C1 |
| 2012 | Near Threatened | C1 |
| 2008 | Near Threatened | B1a+b(iii); C1 |
| 2004 | Near Threatened | |
| 2000 | Lower Risk/Near Threatened | |
| 1994 | Lower Risk/Near Threatened | |
| 1988 | Lower Risk/Least Concern |
| Migratory status | not a migrant | Forest dependency | high |
| Land-mass type |
shelf island |
Average mass | - |
| Estimate | Data quality | |
|---|---|---|
| Extent of Occurrence (breeding/resident) | 63,500 km2 | medium |
| Severely fragmented? | no | - |
| Estimate | Data quality | Derivation | Year of estimate | |
|---|---|---|---|---|
| Population size | 10000-19999 mature individuals | poor | suspected | 2008 |
| Population trend | decreasing | - | suspected | - |
| Generation length | 3.8 years | - | - | - |
Population justification: This species is assumed to have a moderately small population as it is generally uncommon within lowland wet zone forest on Sri Lanka. It is estimated to number 10,000-19,999 mature individuals, equating to 15,000-29,999 individuals in total, rounded here to 15,000-30,000 individuals. Further research is required to refine this estimate.
Trend justification: The population is suspected to be in slow to moderate decline owing to on-going habitat destruction and degradation. The rate of decline is not thought to be more rapid because the species seems able to tolerate human-modified habitats.
| Country/Territory | Presence | Origin | Resident | Breeding visitor | Non-breeding visitor | Passage migrant |
|---|---|---|---|---|---|---|
| Sri Lanka | extant | native | yes |
| Country/Territory | IBA Name |
|---|---|
| Sri Lanka | Amanawala |
| Sri Lanka | Beraliya-Kudagala |
| Sri Lanka | Delgoda / Kudumiriya / Kobahadukanda |
| Sri Lanka | Delwela / Panilkanda / Walankanda |
| Sri Lanka | Gilimale-Eratna |
| Sri Lanka | Haputale |
| Sri Lanka | Kithulgala |
| Sri Lanka | Knuckles Range (Knuckles IBA) |
| Sri Lanka | Morningside and Handapan Ella Plains (Sinharaja IBA) |
| Sri Lanka | Nuwara Eliya |
| Sri Lanka | Tangamalai |
| Sri Lanka | Udawattakele |
| Habitat (level 1) | Habitat (level 2) | Importance | Occurrence |
|---|---|---|---|
| Forest | Subtropical/Tropical Moist Lowland | major | resident |
| Forest | Subtropical/Tropical Moist Montane | major | resident |
| Altitude | 0 - 1950 m | Occasional altitudinal limits |
| Threat (level 1) | Threat (level 2) | Impact and Stresses | |||||||
|---|---|---|---|---|---|---|---|---|---|
| Agriculture & aquaculture | Annual & perennial non-timber crops - Agro-industry farming | Timing | Scope | Severity | Impact | ||||
| Ongoing | Majority (50-90%) | Slow, Significant Declines | Medium Impact: 6 | ||||||
|
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| Agriculture & aquaculture | Annual & perennial non-timber crops - Shifting agriculture | Timing | Scope | Severity | Impact | ||||
| Ongoing | Minority (<50%) | Slow, Significant Declines | Medium Impact: 6 | ||||||
|
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| Biological resource use | Logging & wood harvesting - Unintentional effects: (large scale) [harvest] | Timing | Scope | Severity | Impact | ||||
| Ongoing | Minority (<50%) | Slow, Significant Declines | Medium Impact: 6 | ||||||
|
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| Biological resource use | Logging & wood harvesting - Unintentional effects: (large scale) [harvest] | Timing | Scope | Severity | Impact | ||||
| Past, Unlikely to Return | Minority (<50%) | Slow, Significant Declines | Past Impact | ||||||
|
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| Natural system modifications | Fire & fire suppression - Increase in fire frequency/intensity | Timing | Scope | Severity | Impact | ||||
| Ongoing | Minority (<50%) | Slow, Significant Declines | Low Impact: 5 | ||||||
|
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| Natural system modifications | Fire & fire suppression - Trend Unknown/Unrecorded | Timing | Scope | Severity | Impact | ||||
| Ongoing | Majority (50-90%) | 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 | ||||||
|
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Recommended citation
BirdLife International (2024) Species factsheet: Chestnut-backed Owlet Glaucidium castanotum. Downloaded from
https://datazone.birdlife.org/species/factsheet/chestnut-backed-owlet-glaucidium-castanotum on 22/11/2024.
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 22/11/2024.