• 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. and Fishpool, L.D.C. 2014. HBW and BirdLife International Illustrated Checklist of the Birds of the World. Lynx Edicions BirdLife International, Barcelona, Spain and Cambridge, UK.
del Hoyo, J.; Collar, N. J.; Christie, D. A.; Elliott, A.; Fishpool, L. D. C. 2014. HBW and BirdLife International Illustrated Checklist of the Birds of the World. Barcelona, Spain and Cambridge UK: Lynx Edicions and BirdLife International.

Red List criteria met

Critically Endangered	Endangered	Vulnerable
-	A4bc; C1+2a(i)	A4bc; B1ab(ii,iii,v); C1+2a(i); D1

Red List history

Year	Category	Criteria
2016	Endangered	A4bc; C1+2a(i)
2012	Endangered	C2a(i)
2008	Endangered	C2a(i)
2004	Endangered
2000	Critically Endangered
1996	Critically Endangered
1994	Critically Endangered
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)	121,000 km2	medium
Number of locations	11-100	-
Severely fragmented?	yes	-

	Estimate	Data quality	Derivation	Year of estimate
Population size	250-999 mature individuals	poor	estimated	2011
Population trend	decreasing	medium	inferred	2000-2039
Rate of change over the past 10 years/3 generations (longer of the two periods)	10-19%	-	-	-
Rate of change over the past & future 10 years/3 generations (longer of the two periods)	70-79%	-	-	-
Generation length	12.9 years	-	-	-
Number of subpopulations	2-100	-	-	-

Population justification: The population is estimated at 66-1,660 individuals (0.04-1 individuals/km² x 1,660 km²), but is perhaps best placed in the band 250-999 mature individuals. This equates to 375-1,499 individuals in total, rounded here to 350-1,500 individuals. Hawkins (in litt. 2003) suggests the total population is certainly not less than 250 individuals, and L.-A. Rene de Roland in litt. (2012) suggests 250-650 individuals. Assuming a body mass of 800-1,200 g, data in Newton (1979) suggests a breeding density of c. 0.04-1 birds/km², however the body mass has since been estimated to average 700 g for males and 800 g for females (L.-A. Rene de Roland in litt. 2012).

Trend justification: Hawkins in litt (2003) suggests that the population decrease cannot be more than 30% over the past ten years, but modelling the possible effects of climate change have shown that this species's ecological may decline by as much as 94% due to climate change over the 50 year period from 2000 to 2050 (Andriamasimanana and Cameron 2013). Assuming a linear decrease, this would equate to an ongoing c.72% decline in ecological niche over 3 generations, placed here in the range of 70-79% (ongoing c.48% over 2 generations; c.35% in next generation).

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

Country/Territory	IBA Name
Madagascar	Ambatovaky Special Reserve
Madagascar	Mantadia National Park and Analamazaotra Special Reserve
Madagascar	Marojejy National Park
Madagascar	Marotandrano Special Reserve
Madagascar	Masoala National Park
Madagascar	Sihanaka Forest
Madagascar	South Anjanaharibe Special Reserve and extension
Madagascar	Tsaratanana Strict Nature Reserve and extension
Madagascar	Upper Rantabe Classified Forest
Madagascar	Zahamena National Park and Strict Reserve

Habitat (level 1)	Habitat (level 2)	Importance	Occurrence
Artificial/Terrestrial	Arable Land	marginal	resident
Forest	Subtropical/Tropical Moist Lowland	major	resident
Altitude	0 - 1500 m	Occasional altitudinal limits

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%)		Rapid Declines		Medium Impact: 7
		Stresses Ecosystem degradation, Ecosystem conversion
Biological resource use	Hunting & trapping terrestrial animals - Persecution/control	Timing		Scope		Severity		Impact
		Ongoing		Minority (<50%)		Slow, Significant Declines		Low Impact: 5
		Stresses Species mortality
Biological resource use	Hunting & trapping terrestrial animals - Unintentional effects (species is not the target)	Timing		Scope		Severity		Impact
		Ongoing		Unknown		Unknown		Unknown
		Stresses Competition
Biological resource use	Logging & wood harvesting - Unintentional effects: (large scale) [harvest]	Timing		Scope		Severity		Impact
		Ongoing		Minority (<50%)		Slow, Significant Declines		Low Impact: 5
		Stresses Ecosystem degradation, Ecosystem conversion
Climate change & severe weather	Habitat shifting & alteration	Timing		Scope		Severity		Impact
		Ongoing		Whole (>90%)		Rapid Declines		High Impact: 8
		Stresses Indirect ecosystem effects, Ecosystem degradation, Ecosystem conversion
Energy production & mining	Mining & quarrying	Timing		Scope		Severity		Impact
		Ongoing		Minority (<50%)		Slow, Significant Declines		Low Impact: 5
		Stresses Ecosystem degradation, Ecosystem conversion
Human intrusions & disturbance	Work & other activities	Timing		Scope		Severity		Impact
		Ongoing		Majority (50-90%)		Slow, Significant Declines		Medium Impact: 6
		Stresses Species disturbance
Natural system modifications	Fire & fire suppression - Increase in fire frequency/intensity	Timing		Scope		Severity		Impact
		Ongoing		Majority (50-90%)		Slow, Significant Declines		Medium Impact: 6
		Stresses Ecosystem degradation, Ecosystem conversion

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Recommended citation
BirdLife International (2024) Species factsheet: Madagascar Serpent-eagle Eutriorchis astur. Downloaded from https://datazone.birdlife.org/species/factsheet/madagascar-serpent-eagle-eutriorchis-astur 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.