• Summary
• Text account
• Data table and detailed info
• Distribution map
• Reference and further resources

Taxonomic note

Surniculus lugubris, S. dicruroides, S. musschenbroeki and S. velutinus (del Hoyo and Collar 2014) were previously lumped as S. lugubris following Sibley and Monroe (1990, 1993).

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.

Red List criteria met

Critically Endangered	Endangered	Vulnerable
-	-	-

Red List history

Year	Category	Criteria
2024	Least Concern
2016	Least Concern
2014	Least Concern
2012	Not Recognised
2008	Not Recognised
2004	Not Recognised
2000	Not Recognised
1994	Not Recognised
1988	Not Recognised

Migratory status	full migrant	Forest dependency	medium
Land-mass type		Average mass	-

	Estimate	Data quality
Extent of Occurrence (breeding/resident)	7,750,000 km2
Extent of Occurrence (non-breeding)	6,400,000 km2
Severely fragmented?	no	-

	Estimate	Data quality	Derivation	Year of estimate
Population size	unknown	-	-	-
Population trend	decreasing	-	suspected	-
Generation length	3.67 years	-	-	-

Population justification: The population size has not been quantified owing to recent taxonomic splits. This species is considered to have a medium dependency on forest habitat, and tree cover is estimated to have declined by 17.4% within its mapped range over the past three generations (Global Forest Watch 2022, using Hansen et al. [2013] data and methods disclosed therein). Therefore, as a precautionary measure, it is tentatively suspected that this loss of cover may have led to a decline of between 1-19% in the species' population size over the same time frame.

Trend justification:   .

Country/Territory	Presence	Origin	Resident	Breeding visitor	Non-breeding visitor	Passage migrant
Bangladesh	extant	native		yes
Bhutan	extant	native		yes
Brunei	extant	native	yes
India	extant	native		yes
Indonesia	extant	native	yes
Malaysia	extant	native	yes
Myanmar	extant	native	yes
Nepal	presence uncertain	uncertain		yes
Philippines	extant	native	yes
Singapore	extant	native	yes
Thailand	extant	native	yes

Country/Territory	IBA Name

Habitat (level 1)	Habitat (level 2)	Importance	Occurrence
Artificial/Terrestrial	Rural Gardens	marginal	resident
Forest	Subtropical/Tropical Mangrove Vegetation Above High Tide Level	suitable	breeding
Forest	Subtropical/Tropical Mangrove Vegetation Above High Tide Level	suitable	non-breeding
Forest	Subtropical/Tropical Moist Lowland	suitable	breeding
Forest	Subtropical/Tropical Moist Lowland	suitable	non-breeding
Shrubland	Subtropical/Tropical Dry	suitable	breeding
Shrubland	Subtropical/Tropical Dry	suitable	non-breeding
Altitude	0 - 2100 m	Occasional altitudinal limits

Purpose	Scale
Food - human	subsistence, national
Pets/display animals, horticulture	subsistence, national

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Recommended citation
BirdLife International (2024) Species factsheet: Square-tailed Drongo-cuckoo Surniculus lugubris. Downloaded from https://datazone.birdlife.org/species/factsheet/square-tailed-drongo-cuckoo-surniculus-lugubris on 19/12/2024.
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 19/12/2024.