• 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
C2a(ii)	B1ab(i,ii,iii,iv,v); C2a(i,ii); D	B1ab(i,ii,iii,iv,v); C2a(i,ii); D1+2

Red List history

Year	Category	Criteria
2016	Critically Endangered	C2a(ii)
2012	Not Recognised
2008	Not Recognised
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	9 g

	Estimate	Data quality
Extent of Occurrence (breeding/resident)	440 km2	medium
Number of locations	2-5	-
Severely fragmented?	yes	-

	Estimate	Data quality	Derivation	Year of estimate
Population size	50-249 mature individuals	medium	estimated	2000
Population trend	decreasing	poor	suspected	2001-2011
Generation length	3.6 years	-	-	-
Number of subpopulations	2-100	-	-	-
Percentage of mature individuals in largest subpopulation	90-94%	-	-	-

Population justification: Cordeiro (2000) estimated 150-200 in Amani Nature Reserve. The population on Mount Nilo is essentially unknown, but may be small, so the global estimate is placed precautionarily in the band 50-249 mature individuals.

Trend justification: This species is considered to be declining in parts of its range owing to strong pressures that are impacting unprotected forests in parts of the East Usambaras, and recent disturbance within protected areas such as Amani Nature Reserve. Therefore, we employ a negative population trend overall (though this may be slight). If further research confirms that the species's global population size is stable it may warrant downlisting in the future.

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

Country/Territory	IBA Name
Tanzania	East Usambara Mountains

Habitat (level 1)	Habitat (level 2)	Importance	Occurrence
Forest	Subtropical/Tropical Moist Lowland	suitable	resident
Forest	Subtropical/Tropical Moist Montane	major	resident
Shrubland	Subtropical/Tropical Moist	suitable	resident
Altitude	800 - 1250 m	Occasional altitudinal limits

Threat (level 1)	Threat (level 2)	Impact and Stresses
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
Biological resource use	Logging & wood harvesting - Unintentional effects: (subsistence/small scale) [harvest]	Timing		Scope		Severity		Impact
		Ongoing		Majority (50-90%)		Slow, Significant Declines		Medium Impact: 6
		Stresses Ecosystem degradation
Climate change & severe weather	Habitat shifting & alteration	Timing		Scope		Severity		Impact
		Future		Whole (>90%)		Unknown		Unknown
		Stresses Indirect ecosystem effects, Ecosystem degradation
Invasive and other problematic species, genes & diseases	Invasive non-native/alien species/diseases - Maesopsis eminii	Timing		Scope		Severity		Impact
		Ongoing		Majority (50-90%)		Unknown		Unknown
		Stresses Ecosystem degradation

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Recommended citation
BirdLife International (2024) Species factsheet: Long-billed Forest-warbler Artisornis moreaui. Downloaded from https://datazone.birdlife.org/species/factsheet/long-billed-forest-warbler-artisornis-moreaui on 28/11/2024.
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 28/11/2024.