• 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. Volume 1: Non-passerines. Lynx Edicions BirdLife International, Barcelona, Spain and Cambridge, UK.

Red List criteria met

Critically Endangered	Endangered	Vulnerable
-	-	C2a(ii)

Red List history

Year	Category	Criteria
2022	Vulnerable	C2a(ii)
2016	Vulnerable	C2a(ii)
2012	Vulnerable	C2a(ii)
2008	Vulnerable	C2a(ii)
2004	Vulnerable
2000	Vulnerable
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)	1,200,000 km2	medium
Severely fragmented?	no	-

	Estimate	Data quality	Derivation	Year of estimate
Population size	3200-4000 mature individuals	medium	estimated	2016
Population trend	decreasing	poor	inferred	2000-2030
Rate of change over the past 10 years/3 generations (longer of the two periods)	10-19%	-	-	-
Rate of change over the future 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)	10-19%	-	-	-
Generation length	9.94 years	-	-	-
Number of subpopulations	1	-	-	-
Percentage of mature individuals in largest subpopulation	100%	-	-	-

Population justification: Based on a territory mapping exercise in the extensive Crater Mountain Wildlife Management Area (comprising, at the time, of c.85% montane forest and c.15% cultivation), Watson and Asoyama (2001) estimated a suitable density of one pair (= two mature individuals) per 150 km² of forest (accounting both for density and occupancy). Bryan et al. (2015) suggested an area of suitable rainforest habitat of c.250,000 km² exists on New Guinea, suggesting a total population size of 1,600 pairs. However, since the Crate Wildlife Management Area contains habitat not suitable, and the species has also been recorded (albeit at low densities) in monsoon forest, the population is perhaps higher. Consequently, the population size of this species is estimated at 1,600-2,000 pairs, or 3,200-4,000 mature individuals.

Trend justification: Based on data between 2000 and 2021 (Global Forest Watch 2022, based on methods and data from Hansen et al. [2013]), forest cover is estimated to have been reduced in this species' range by c.7-9% in the three generation period (c.30 years; Bird et al. 2020) to 2021. Given this species' forest dependence, this is thought to have caused a reduction in population size at least equal. Hunting remains a key threat to this species in areas close to villages (Watson and Asoyama 2001) and this is thought to have additive impacts, such that the population is suspected of declining at an ongoing rate of 10-19% over three generations.

Country/Territory	Presence	Origin	Resident	Breeding visitor	Non-breeding visitor	Passage migrant
Indonesia	extant	native	yes
Papua New Guinea	extant	native	yes

Country/Territory	IBA Name

Habitat (level 1)	Habitat (level 2)	Importance	Occurrence
Forest	Subtropical/Tropical Moist Lowland	major	resident
Forest	Subtropical/Tropical Moist Montane	major	resident
Savanna	Dry	suitable	resident
Shrubland	Subtropical/Tropical Moist	suitable	resident
Altitude	0 - 2000 m	Occasional altitudinal limits	(max) 3700 m

Threat (level 1)	Threat (level 2)	Impact and Stresses
Agriculture & aquaculture	Annual & perennial non-timber crops - Shifting agriculture	Timing		Scope		Severity		Impact
		Ongoing		Minority (<50%)		Slow, Significant Declines		Low Impact: 5
		Stresses Ecosystem degradation, Ecosystem conversion
Biological resource use	Hunting & trapping terrestrial animals - Intentional use (species is the target)	Timing		Scope		Severity		Impact
		Ongoing		Majority (50-90%)		Slow, Significant Declines		Medium Impact: 6
		Stresses Species mortality
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

Purpose	Primary form used	Life stage used	Source	Scale	Level	Timing
Handicrafts, jewellery, etc.	-	-			non-trivial	recent

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Recommended citation
BirdLife International (2023) Species factsheet: Harpyopsis novaeguineae. Downloaded from http://datazone.birdlife.org/species/factsheet/papuan-eagle-harpyopsis-novaeguineae on 03/12/2023.
Recommended citation for factsheets for more than one species: BirdLife International (2023) IUCN Red List for birds. Downloaded from http://datazone.birdlife.org on 03/12/2023.