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

Taxonomic source(s)
del Hoyo, J., Collar, N.J., Christie, D.A., Elliott, A., Fishpool, L.D.C., Boesman, P. and Kirwan, G.M. 2016. HBW and BirdLife International Illustrated Checklist of the Birds of the World. Volume 2: Passerines. Lynx Edicions and BirdLife International, Barcelona, Spain and Cambridge, UK.

Red List criteria met

Critically Endangered	Endangered	Vulnerable
-	-	-

Red List history

Year	Category	Criteria
2024	Near Threatened	B1b(ii,iii,v)
2016	Near Threatened	B1ab(ii,iii,v);C1
2012	Near Threatened	B1ab(ii,iii,v);C1
2008	Near Threatened	B1a+b(ii,iii,v); 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	medium
Land-mass type		Average mass	-

	Estimate	Data quality
Extent of Occurrence (breeding/resident)	4,640 km2	medium
Severely fragmented?	no	-

	Estimate	Data quality	Derivation	Year of estimate
Population size	20000 mature individuals	-	estimated	2016
Population trend	decreasing	poor	inferred	-
Generation length	3.75 years	-	-	-
Number of subpopulations	2	-	-	-
Percentage of mature individuals in largest subpopulation	1-89%	-	-	-

Population justification: The species is described as generally uncommon (Beichle and Maelzer 1985, del Hoyo et al. 2005, O'Brien and Masibalavu 2017), though numerous at some sites (Butler 2012). Based on point count data from 2016, the population has been estimated to number approximately 20,000 mature individuals (O'Brien and Masibalavu 2017).

Trend justification: This species is forest-dependent, and although remote sensing data are not available to detect current rates of forest loss (Global Forest Watch 2023, using data from Hansen et al. [2013] and methods disclosed therein), loss and degradation of forest habitat due to agricultural encroachment, logging and invasive species is thought to be ongoing (G. Dutson in litt. 2011, Butler 2012). Although the population trend has not been quantified directly, in 2017/18 surveys the species was recorded at only two of ten  sites occupied two years previously (R. Stirnemann in litt. 2020). As such, tentatively, a continuing decline is inferred.

Country/Territory	Presence	Origin	Resident	Breeding visitor	Non-breeding visitor	Passage migrant
Samoa	extant	native	yes

Country/Territory	IBA Name
Samoa	Apia Catchments
Samoa	Central Savaii Rainforest
Samoa	Eastern Upolu Craters
Samoa	O Le Pupu-Pu'e National Park
Samoa	Uafato-Tiavea Forest

Habitat (level 1)	Habitat (level 2)	Importance	Occurrence
Artificial/Terrestrial	Pastureland	marginal	resident
Artificial/Terrestrial	Plantations	marginal	resident
Forest	Subtropical/Tropical Moist Lowland	major	resident
Forest	Subtropical/Tropical Moist Montane	major	resident
Altitude	10 - 1800 m	Occasional altitudinal limits

Threat (level 1)	Threat (level 2)	Impact and Stresses
Agriculture & aquaculture	Annual & perennial non-timber crops - Shifting agriculture	Timing		Scope		Severity		Impact
		Ongoing		Minority (<50%)		Slow, Significant Declines		Low Impact: 5
		Stresses Ecosystem degradation, Ecosystem conversion
Agriculture & aquaculture	Annual & perennial non-timber crops - Small-holder farming	Timing		Scope		Severity		Impact
		Ongoing		Minority (<50%)		Slow, Significant Declines		Low Impact: 5
		Stresses Ecosystem degradation, Ecosystem conversion
Agriculture & aquaculture	Livestock farming & ranching - Agro-industry grazing, ranching or farming	Timing		Scope		Severity		Impact
		Ongoing		Minority (<50%)		Unknown		Unknown
		Stresses Ecosystem degradation, Ecosystem conversion
Biological resource use	Logging & wood harvesting - Unintentional effects: (subsistence/small scale) [harvest]	Timing		Scope		Severity		Impact
		Ongoing		Minority (<50%)		Slow, Significant Declines		Low Impact: 5
		Stresses Ecosystem degradation, Ecosystem conversion
Climate change & severe weather	Storms & flooding	Timing		Scope		Severity		Impact
		Past, Likely to Return		Majority (50-90%)		Rapid Declines		Past Impact
		Stresses Ecosystem degradation
Invasive and other problematic species, genes & diseases	Invasive non-native/alien species/diseases - Named species	Timing		Scope		Severity		Impact
		Ongoing		Majority (50-90%)		Slow, Significant Declines		Medium Impact: 6
		Stresses Reduced reproductive success, Species mortality
Invasive and other problematic species, genes & diseases	Invasive non-native/alien species/diseases - Unspecified species	Timing		Scope		Severity		Impact
		Ongoing		Majority (50-90%)		Slow, Significant Declines		Medium Impact: 6
		Stresses Indirect ecosystem effects, Ecosystem degradation

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Recommended citation
BirdLife International (2024) Species factsheet: Samoan Triller Lalage sharpei. Downloaded from https://datazone.birdlife.org/species/factsheet/samoan-triller-lalage-sharpei on 23/11/2024.
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 23/11/2024.