VU
Giant Scops-owl Otus gurneyi



Taxonomy

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. Volume 1: Non-passerines. Lynx Edicions BirdLife International, Barcelona, Spain and Cambridge, UK.

IUCN Red list criteria met and history
Red List criteria met
Critically Endangered Endangered Vulnerable
- - A2c+3c+4c; C2a(i)

Red List history
Year Category Criteria
2016 Vulnerable A2c+3c+4c; C2a(i)
2013 Vulnerable A2c+3c+4c;C2a(i)
2012 Vulnerable A2c+3c+4c;C2a(i)
2008 Vulnerable A2c; A3c; A4c; C2a(i)
2004 Vulnerable
2000 Vulnerable
1996 Endangered
1994 Endangered
1988 Near Threatened
Species attributes

Migratory status not a migrant Forest dependency High
Land mass type Land-mass type - shelf island
Average mass -
Extent of occurrence (EOO)

Estimate Data quality
Extent of Occurrence breeding/resident (km2) 253,000 medium
Number of locations 11-100 -
Fragmentation -
Population and trend
Estimate Data quality Derivation Year of estimate
No. of mature individuals 2500-9999 poor estimated 1999
Population trend Decreasing poor suspected -
Decline (3 years/1 generation past) - - -
Decline (5 years/1 generation past) - - -
Decline (10 years/1 generation past) - - -
Decline (10 years/3 generation future) 30-49 - - -
Decline (10 years/3 generation past and future) 30-49 - - -
Number of subpopulations 2-100 - - -
Largest subpopulations - - -
Generation length (yrs) 6.7 - - -

Population justification: The population size is preliminarily estimated to fall into the band 2,500-9,999 mature individuals. This equates to 3,750-14,999 individuals, rounded here to 3,500-15,000 individuals.

Trend justification: Dinagat has been almost totally deforested and rates of deforestation on Samar and Mindanao have been rapid, with virtually all remaining forest leased to logging or mining concessions. Hence, the species is suspected to be declining rapidly.


Country/territory distribution
Country/Territory Occurrence status Presence Resident Breeding Non-breeding Passage
Philippines N Extant Yes

Important Bird and Biodiversity Areas (IBA)
Country/Territory IBA Name
Philippines Lake Lanao
Philippines Mount Agtuuganon and Mount Pasian
Philippines Mount Apo Natural Park
Philippines Mount Busa-Kiamba
Philippines Mount Dapiak-Mount Paraya
Philippines Mount Diwata Range
Philippines Mount Hamiguitan Range Wildlife Sanctuary
Philippines Mount Hilong-hilong
Philippines Mount Kambinlio and Mount Redondo
Philippines Mount Kitanglad Range Natural Park
Philippines Mount Latian complex
Philippines Mount Matutum Protected Landscape
Philippines Pasonanca Natural Park
Philippines Siargao Island Protected Landscape and Seascape

Habitats & altitude
Habitat (level 1) Habitat (level 2) Importance Occurrence
Forest Subtropical/Tropical Moist Lowland major resident
Altitude 0 - 670 m Occasional altitudinal limits  

Threats & impact
Threat (level 1) Threat (level 2) Impact and Stresses
Agriculture & aquaculture Wood & pulp plantations - Scale Unknown/Unrecorded Timing Scope Severity Impact
Ongoing Minority (<50%) Rapid Declines Medium Impact: 6
Stresses
Ecosystem degradation, Ecosystem conversion
Biological resource use Logging & wood harvesting - Unintentional effects: (large scale) [harvest] Timing Scope Severity Impact
Ongoing Majority (50-90%) Rapid Declines Medium Impact: 7
Stresses
Ecosystem degradation
Climate change & severe weather Timing Scope Severity Impact
Future Minority (<50%) Rapid Declines Low Impact: 4
Stresses
Species disturbance, Ecosystem degradation, Species mortality
Energy production & mining Timing Scope Severity Impact
Ongoing Minority (<50%) Rapid Declines Medium Impact: 6
Stresses
Ecosystem degradation, Ecosystem conversion
Natural system modifications Fire & fire suppression - Increase in fire frequency/intensity Timing Scope Severity Impact
Ongoing Minority (<50%) Rapid Declines Medium Impact: 6
Stresses
Ecosystem degradation, Ecosystem conversion

Recommended citation
BirdLife International (2019) Species factsheet: Otus gurneyi. Downloaded from http://www.birdlife.org on 18/04/2019. Recommended citation for factsheets for more than one species: BirdLife International (2019) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 18/04/2019.