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

Taxonomic note

Scepomycter winifredae (del Hoyo and Collar 2016) was previously listed as Bathmocercus winifredae.

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)	C2a(i,ii); D1

Red List history

Year	Category	Criteria
2021	Near Threatened	C2a(i); D1
2017	Vulnerable	B2ab(i,ii,iii,v); C2a(i); D1
2016	Vulnerable	B1ab(i,ii,iii,v); C2a(i); D1
2012	Vulnerable	B1ab(i,ii,iii,v)
2008	Vulnerable	B1a+b(i,ii,iii,v)
2004	Vulnerable
2000	Vulnerable
1996	Vulnerable
1994	Vulnerable
1988	Threatened

Migratory status	not a migrant	Forest dependency	high
Land-mass type	continent	Average mass	-

	Estimate	Data quality
Extent of Occurrence (breeding/resident)	28,300 km2	medium
Area of Occupancy (breeding/resident)	4,444 km2
Severely fragmented?	no	-

	Estimate	Data quality	Derivation	Year of estimate
Population size	330-1000 mature individuals	poor	suspected	2016
Population trend	decreasing	-	inferred	2012-2022
Rate of change over the past 10 years/3 generations (longer of the two periods)	1-10%	-	-	-
Rate of change over the future 10 years/3 generations (longer of the two periods)	1-10%	-	-	-
Rate of change over the past & future 10 years/3 generations (longer of the two periods)	1-10%	-	-	-
Generation length	2.73 years	-	-	-
Number of subpopulations	2-100	-	-	-
Percentage of mature individuals in largest subpopulation	1-89%	-	-	-

Population justification: The population size was preliminarily estimated to fall into the band 10,000-19,999 individuals, however this is likely to be too high and may instead be 500-1,500 individuals (L. Hansen in litt. 2016). This roughly equates to 330-1,000 mature individuals.

The species has two subspecies (Pearson and Kirwan 2020), and based on its distribution, it is assumed to form multiple subpopulations. With a suspected population size of 330-1000 mature individuals, it is assumed that there are <1,000 mature individuals in the largest subpopulation.

Trend justification: The population is inferred to be declining owing to ongoing forest loss. Between 2009-2019, forest habitat within this species's range decline by 6.5% (Global Forest Watch 2020). This species can tolerate some disturbance (J. Fjeldså in litt. 2007). Based on the threat of habitat loss, these declines are suspected to continue at the same rate into the future.

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

Country/Territory	IBA Name
Tanzania	Rubeho Mountains
Tanzania	Udzungwa Mountains
Tanzania	Udzungwa National Park
Tanzania	Ukaguru Mountains
Tanzania	Uluguru Mountains

Habitat (level 1)	Habitat (level 2)	Importance	Occurrence
Forest	Subtropical/Tropical Moist Montane	major	resident
Altitude	1300 - 2430 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
Climate change & severe weather	Habitat shifting & alteration	Timing		Scope		Severity		Impact
		Future		Whole (>90%)		Unknown		Unknown
		Stresses Indirect ecosystem effects, Ecosystem degradation

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Recommended citation
BirdLife International (2024) Species factsheet: Winifred's Warbler Scepomycter winifredae. Downloaded from https://datazone.birdlife.org/species/factsheet/winifreds-warbler-scepomycter-winifredae 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.