Helmet Vanga Euryceros prevostii


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
- A3bc A3bc; B1ab(ii,iii,v)

Red List history
Year Category Criteria
2018 Endangered A3bc
2016 Vulnerable B1ab(ii,iii,v)
2012 Vulnerable B1ab(ii,iii,v)
2008 Vulnerable B1a+b(ii,iii,v)
2004 Vulnerable
2000 Vulnerable
1994 Lower Risk/Near Threatened
1988 Lower Risk/Least Concern
Species attributes

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

Estimate Data quality
Extent of Occurrence breeding/resident (km2) 16,200 medium
Number of locations 11-100 -
Severely fragmented? yes -
Population and trend
Value Data quality Derivation Year of estimate
Number of mature individuals 6000-15000 poor estimated 2000
Population trend decreasing medium suspected 1998-2008
Decline % (10 years/3 generations future) 50-79 - - -
Number of subpopulations 2-100 - - -
Generation length (years) 7.1 - - -

Population justification: The population size is preliminarily estimated to fall into the band 10,000-19,999 individuals. This equates to 6,667-13,333 mature individuals, rounded here to 6,000-15,000 mature individuals. However, the population size is now potentially lower (M. Rabenandrasana in litt. 2017).

Trend justification: The population is suspected to be declining in line with the clearance and degradation of lowland rainforest within the range. Modelling the possible effects of climate change have shown that this species's ecological niche may nearly completely disappear due to climate change over the 50 year period from 2000 to 2050 (Andriamasimanana and Cameron 2013). Depending on when climate change begins to noticeably impact the species's habitat, this could equate to a decline in its ecological niche in the range of 50-79% over its next 3 generations (21 years).

Country/territory distribution
Country/Territory Presence Origin Resident Breeding Non-breeding Passage
Madagascar extant native yes

Important Bird and Biodiversity Areas (IBA)
Country/Territory IBA Name
Madagascar Tsaratanana Strict Nature Reserve and extension
Madagascar South Anjanaharibe Special Reserve and extension
Madagascar Marojejy National Park
Madagascar Masoala National Park
Madagascar Anjanaharibe Classified Forest
Madagascar Upper Rantabe Classified Forest
Madagascar Ambatovaky Special Reserve
Madagascar Bezavona Classified Forest
Madagascar Zahamena National Park and Strict Reserve
Madagascar Betampona Strict Nature Reserve
Madagascar Mantadia National Park and Analamazaotra Special Reserve
Madagascar Mananara-North Biosphere Reserve

Habitats & altitude
Habitat (level 1) Habitat (level 2) Importance Occurrence
Forest Subtropical/Tropical Moist Lowland major resident
Forest Subtropical/Tropical Moist Montane suitable resident
Altitude 0 - 1000 m Occasional altitudinal limits  

Threats & impact
Threat (level 1) Threat (level 2) Impact and Stresses
Agriculture & aquaculture Annual & perennial non-timber crops - Shifting agriculture Timing Scope Severity Impact
Ongoing Majority (50-90%) Slow, Significant Declines Medium Impact: 6
Ecosystem degradation, Ecosystem conversion
Biological resource use Logging & wood harvesting - Unintentional effects: (large scale) [harvest] 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%) Rapid Declines Medium Impact: 6
Ecosystem degradation, Ecosystem conversion

Recommended citation
BirdLife International (2023) Species factsheet: Euryceros prevostii. Downloaded from http://datazone.birdlife.org/species/factsheet/helmet-vanga-euryceros-prevostii on 25/09/2023. Recommended citation for factsheets for more than one species: BirdLife International (2023) IUCN Red List for birds. Downloaded from http://datazone.birdlife.org on 25/09/2023.