Winifred's Warbler Scepomycter winifredae


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.

IUCN Red list criteria met and history
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
Species attributes

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

Estimate Data quality
Extent of Occurrence breeding/resident (km2) 28,300 medium
Extent of Occurrence breeding/resident (km2) 4,444
Number of locations -
Severely Fragmented -
Population and trend
Value Data quality Derivation Year of estimate
No. of mature individuals 330-1000 poor suspected 2016
Population trend Decreasing inferred -
Decline (3 years/1 generation past) - - -
Decline (5 years/1 generation past) - - -
Decline (10 years/1 generation past) - - -
Decline (10 years/3 generation future) 1-10 - - -
Decline (10 years/3 generation past and future) 1-10 - - -
Number of subpopulations 2-100 - - -
Percentage 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 distribution
Country/Territory Occurrence status Presence Resident Breeding Non-breeding Passage
Tanzania N Extant Yes

Important Bird and Biodiversity Areas (IBA)
Country/Territory IBA Name
Tanzania Udzungwa National Park
Tanzania Rubeho Mountains
Tanzania Udzungwa Mountains
Tanzania Ukaguru Mountains
Tanzania Uluguru Mountains
Tanzania Udzungwa Mountain Range

Habitats & altitude
Habitat (level 1) Habitat (level 2) Importance Occurrence
Forest Subtropical/Tropical Moist Montane major resident
Altitude 1300 - 2430 m Occasional altitudinal limits  

Threats & impact
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
Ecosystem degradation, Ecosystem conversion
Climate change & severe weather Habitat shifting & alteration Timing Scope Severity Impact
Future Whole (>90%) Unknown Unknown
Indirect ecosystem effects, Ecosystem degradation

Recommended citation
BirdLife International (2022) Species factsheet: Scepomycter winifredae. Downloaded from http://www.birdlife.org on 15/08/2022. Recommended citation for factsheets for more than one species: BirdLife International (2022) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 15/08/2022.