• Summary
• Text account
• Data table and detailed info
• Distribution map
• Reference and further resources

Taxonomic source(s)
Christidis, L. and Boles, W.E. 2008. Systematics and Taxonomy of Australian Birds. CSIRO Publishing, Collingwood, Australia.
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
-	-	-

Red List history

Year	Category	Criteria
2021	Near Threatened	C1
2016	Near Threatened	C1
2012	Near Threatened	C1
2008	Near Threatened	C1
2004	Near Threatened
2000	Lower Risk/Near Threatened
1994	Lower Risk/Near Threatened
1988	Lower Risk/Least Concern

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

	Estimate	Data quality
Extent of Occurrence (breeding/resident)	1,690,000 km2	medium
Severely fragmented?	no	-

	Estimate	Data quality	Derivation	Year of estimate
Population size	2500-9999 mature individuals	poor	estimated	2016
Population trend	decreasing	poor	suspected	2000-2040
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	13.4 years	-	-	-
Percentage of mature individuals in largest subpopulation	100%	-	-	-

Population justification: The global population of Gurney's Eagles was suspected to be between 1,000 and 10,000 individuals (Ferguson-Lees and Christie 2001, 2005) however, there are an estimated 800-900 pairs of Gurney's Eagles in the North Moluccas alone (Røv and Gjershaug 2000) so the higher end of the global estimate may be more realistic (S. Debus in litt. 2016). The number of mature individuals is therefore placed in the band 2,500-9,999. The species is estimated to occur at a density of one pair per 33 km² of land area in the North Moluccas (Røv and Gjershaug 2000).

Trend justification: The species is suspected to be in decline owing to habitat loss and degradation. For example, across mainland Papua New Guinea, 1.2% of forest was lost, and 2.4% of forest logged between 2002-2014 (Bryan and Shearman 2015). This translates to approximately 3.9% forest loss and 7.8% forest logging over the course of three generations (40 years) (Bird et al. 2020). Based on a long generation length and marginal forest loss and logging estimates therefore, the population is suspected to be undergoing a likely reduction of <10%.

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

Country/Territory	IBA Name

Habitat (level 1)	Habitat (level 2)	Importance	Occurrence
Artificial/Terrestrial	Arable Land	marginal	resident
Artificial/Terrestrial	Plantations	suitable	resident
Artificial/Terrestrial	Subtropical/Tropical Heavily Degraded Former Forest	suitable	resident
Forest	Subtropical/Tropical Moist Lowland	major	resident
Forest	Subtropical/Tropical Moist Montane	suitable	resident
Forest	Subtropical/Tropical Swamp	suitable	resident
Altitude	0 - 1000 m	Occasional altitudinal limits	(max) 3000 m

Threat (level 1)	Threat (level 2)	Impact and Stresses
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, Ecosystem conversion

---

Recommended citation
BirdLife International (2024) Species factsheet: Gurney's Eagle Aquila gurneyi. Downloaded from https://datazone.birdlife.org/species/factsheet/gurneys-eagle-aquila-gurneyi on 09/12/2024.
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 09/12/2024.