• 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)	C2a(ii); D2

Red List history

Year	Category	Criteria
2016	Endangered	C2a(ii)
2012	Endangered	B1ab(i,ii,iii,v)
2008	Endangered	B1a+b(i,ii,iii,v)
2004	Endangered
2000	Endangered
1996	Vulnerable
1994	Vulnerable
1988	Threatened

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

	Estimate	Data quality
Extent of Occurrence (breeding/resident)	28,000 km2	medium
Number of locations	2	-
Severely fragmented?	yes	-

	Estimate	Data quality	Derivation	Year of estimate
Population size	1500-7000 mature individuals	poor	estimated	1999
Population trend	decreasing	medium	suspected	1998-2008
Generation length	7.1 years	-	-	-
Number of subpopulations	2-100	-	-	-

Population justification: The total population is estimated at 2,272 individuals, thus it may lie at the lower end of the range 2,500-9,999 individuals. This range equates to 1,667-6,666 mature individuals, rounded here to 1,500-7,000 mature individuals. Mizuta et al. (2001) estimate territories of 5-8 ha, non-contiguous separated by c.200m, thus giving a 100m extra buffer around each territory. Hence an 8 ha territory takes up 24 ha. This is equivalent to 4 pairs/km², or 8 indivs/km². Habitat area: 20% of 1420 km² = 284 km². Total Population: 8 x 284 km² = 2272 indivs. This estimate may be an optimistic minimum because the Jardin Botanique study site of Mizuta et al. (2001) is likely to have been chosen for ease of study.

Trend justification: The population is suspected to be in decline owing to the ongoing destruction and degradation of its forest habitat (ZICOMA 1999). The likely rate of decline, however, has not been estimated.

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

Country/Territory	IBA Name
Madagascar	Analamerana Special Reserve
Madagascar	Ankarafantsika National Park and Ampijoroa
Madagascar	Ankarana Special Reserve

Habitat (level 1)	Habitat (level 2)	Importance	Occurrence
Forest	Subtropical/Tropical Dry	major	resident
Altitude	0 - 150 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		Majority (50-90%)		Slow, Significant Declines		Medium Impact: 6
		Stresses Ecosystem degradation, Ecosystem conversion
Biological resource use	Logging & wood harvesting - Unintentional effects: (large scale) [harvest]	Timing		Scope		Severity		Impact
		Ongoing		Minority (<50%)		Causing/Could cause fluctuations		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		Minority (<50%)		Slow, Significant Declines		Low Impact: 5
		Stresses Ecosystem degradation
Natural system modifications	Fire & fire suppression - Increase in fire frequency/intensity	Timing		Scope		Severity		Impact
		Ongoing		Whole (>90%)		Slow, Significant Declines		Medium Impact: 7
		Stresses Ecosystem degradation, Ecosystem conversion

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Recommended citation
BirdLife International (2024) Species factsheet: Van Dam's Vanga Xenopirostris damii. Downloaded from https://datazone.birdlife.org/species/factsheet/van-dams-vanga-xenopirostris-damii on 23/11/2024.
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 23/11/2024.