Black-and-white Shrike-flycatcher (Bias musicus) | Details

Black-and-white Shrike-flycatcher Bias musicus

Current view: Data table and detailed info

Taxonomy

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
-	-	-

Red List history

Year	Category	Criteria
2024	Least Concern
2016	Least Concern
2012	Least Concern
2009	Least Concern
2008	Least Concern
2004	Least Concern
2000	Lower Risk/Least Concern
1994	Lower Risk/Least Concern
1988	Lower Risk/Least Concern

Species attributes

Migratory status	not a migrant	Forest dependency	medium
Land-mass type		Average mass	22 g

Range

	Estimate	Data quality
Extent of Occurrence (breeding/resident)	10,800,000 km²	medium
Severely fragmented?	no	-

Population

	Estimate	Data quality	Derivation	Year of estimate
Population size	unknown	-	-	-
Population trend	decreasing	-	suspected	-
Generation length	4.04 years	-	-	-

Population justification: The global population size has not been quantified, but the species is reported to be uncommon to common (Urban et al. 1997). This species is considered to have a medium dependency on forest habitat, and tree cover is estimated to have declined by 11.1% 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 distribution

Country/Territory	Presence	Origin	Resident	Non-breeding visitor
Angola	extant	native	yes
Benin	extant	native	yes
Cameroon	extant	native	yes
Central African Republic	extant	native	yes
Congo	extant	native	yes
Congo, The Democratic Republic of the	extant	native	yes
Côte d'Ivoire	extant	native	yes
Equatorial Guinea	extant	native	yes
Gabon	extant	native	yes
Gambia	extant	vagrant		yes
Ghana	extant	native	yes
Guinea	extant	native	yes
Guinea-Bissau	extant	native	yes
Kenya	extant	native	yes
Liberia	extant	native	yes
Malawi	extant	native	yes
Mozambique	extant	native	yes
Nigeria	extant	native	yes
Sierra Leone	extant	native	yes
South Sudan	extant	native	yes
Sudan	extant	native	yes
Tanzania	extant	native	yes
Togo	extant	native	yes
Uganda	extant	native	yes
Zimbabwe	extant	native	yes

Important Bird and Biodiversity Areas (IBA)

Country/Territory	IBA Name

Habitats & altitude

Habitat (level 1)	Habitat (level 2)	Importance	Occurrence
Artificial/Terrestrial	Subtropical/Tropical Heavily Degraded Former Forest	suitable	resident
Forest	Subtropical/Tropical Moist Lowland	major	resident
Forest	Subtropical/Tropical Moist Montane	major	resident
Altitude	0 - 2320 m	Occasional altitudinal limits

Recommended citation
BirdLife International (2024) Species factsheet: Black-and-white Shrike-flycatcher Bias musicus. Downloaded from https://datazone.birdlife.org/species/factsheet/black-and-white-shrike-flycatcher-bias-musicus on 26/12/2024.
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 26/12/2024.