• 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
2021	Near Threatened	B1ab(iii)
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

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

	Estimate	Data quality
Extent of Occurrence (breeding/resident)	9,400 km2
Number of locations	11-30	-
Severely fragmented?	no	-

	Estimate	Data quality	Derivation	Year of estimate
Population size	unknown	-	-	-
Population trend	decreasing	-	suspected	2016-2027
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	3.8 years	-	-	-
Number of subpopulations	3	-	-	-

Population justification: The global population size has not been quantified, but the species is described as fairly common to common (del Hoyo et al. 2005).

Trend justification: This species has a high forest dependency, but appears tolerant to some degree of habitat degradation for the establishment of plantations (Collar 2020). Forest on Comoros is experiencing ongoing loss and degradation (Global Forest Watch 2021), likely for subsistence farmland and fuel wood (Sewall et al. 2003), therefore this species is suspected to be declining overall. Between 2001-2019, this species experienced forest cover loss of 4% (Global Forest Watch 2021). This would equate to 2.4% over 3 generations. Between 2016-2019, this species experienced forest cover loss of 0.68% (Global Forest Watch 2021), which would equate to a loss of c.2% when projected forward 3 generations from 2016. Assuming that the population declines at a similar rate, the rate of decline is suspected to fall into the band 1-10%.

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

Country/Territory	IBA Name
Comoros	Karthala Mountains
Comoros	La Grille Mountains
Comoros	Mont Mlédjélé (Mwali highlands)
Comoros	Ndzuani highlands

Habitat (level 1)	Habitat (level 2)	Importance	Occurrence
Artificial/Terrestrial	Subtropical/Tropical Heavily Degraded Former Forest	suitable	resident
Forest	Subtropical/Tropical Moist Lowland	suitable	resident
Forest	Subtropical/Tropical Moist Montane	major	resident
Shrubland	Subtropical/Tropical High Altitude	suitable	resident
Altitude	0 - 1850 m	Occasional altitudinal limits	(max) 2050 m

Threat (level 1)	Threat (level 2)	Impact and Stresses
Agriculture & aquaculture	Annual & perennial non-timber crops - Small-holder farming	Timing		Scope		Severity		Impact
		Ongoing		Majority (50-90%)		Negligible 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%)		Negligible declines		Low Impact: 5
		Stresses Species disturbance, Ecosystem degradation
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: Comoro Thrush Turdus bewsheri. Downloaded from https://datazone.birdlife.org/species/factsheet/comoro-thrush-turdus-bewsheri on 27/11/2024.
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 27/11/2024.