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[[Image:Gurneys_Eagle.jpg|thumb|350px|right|Bird in flight. Note secondary bulge. Photo © by {{user|mehdhalaouate|Mehd Halaouate}}<br />Biak, [[Papua]], [[Indonesia]], October 2005]] | [[Image:Gurneys_Eagle.jpg|thumb|350px|right|Bird in flight. Note secondary bulge. Photo © by {{user|mehdhalaouate|Mehd Halaouate}}<br />Biak, [[Papua]], [[Indonesia]], October 2005]] | ||
| − | * | + | *plumage overall blackish-brown |
*[[Topography#Heads|Cere]] grey brown | *[[Topography#Heads|Cere]] grey brown | ||
Revision as of 12:30, 27 July 2023
- Aquila gurneyi
Identification
66–86 cm, 26-33.9 inches.
Wingspan 165–185 cm. Immature female 3060 g
Adult
- plumage overall blackish-brown
- Cere grey brown
In comparison to other Aquila:
- tarsal feathers paler
- legs slimmer
- wings shorter (e.g. cf Black Eagle
- secondaries bulge outwards
- flight feathers often with whitish markings
- tail long
Juvenile
- Browner above with grey brown marbling
- Underparts getting lighter with creamy abdomen and legs
- Third and fourth year plumage has less marbled upperparts, lighter brown or cream head and underparts
Similar species
- Wedge-tailed Eagle have
- Less yellow feet
- Shorter, less rounded tail
- More reddish brown in colour
- In Moluccas the Black Eagle is different for the following reasons;
- Averages slightly smaller (65-80 cm)
- Wings are narrower at the base giving a more paddle shaped appearance
- Variable amounts of white on the rump, around the beak, and eyes
- A more distinct white patch at the base of the primaries
- Male is between 2% and 11% smaller than female (wingspan 510–520 mm, 530–568 mm in female)
- Bare parts darker yellow
- Iris darker yellow, brown changeing to pale yellow in Juvenile
- Juvenile White-bellied Sea-Eagle normally has a much paler rump, underwing and undertail
Distribution
New Guinea, the Aru Islands and northern Maluku (Moluccas). Recorded in the Cyclops Mountains, on Biak Island and the Vogelkop Peninsula in Irian Jaya and near Vanimo in Papua New Guinea.
Taxonomy
This is a monotypic species[1].
Habitat
Coastal and swamp forests and forest edges.
Behaviour
Solitary or in pairs, occasionally in threes, but this thought to be family groups
Diet
Small mammals, such as cuscus and woodland possums. Forages by soaring low over the forest canopy and open spaces. Is known to use thermals along cliff edges and hillsides.
Breeding
They are known to build a large stick nest high in a tree, but little other information is available.
Vocalisation
A nasal sound of medium to high pitch (but descending) with a piping quality, is repeated about once per second.
References
- Clements, J. F., T. S. Schulenberg, M. J. Iliff, T. A. Fredericks, J. A. Gerbracht, D. Lepage, S. M. Billerman, B. L. Sullivan, and C. L. Wood. 2022. The eBird/Clements checklist of Birds of the World: v2022. Downloaded from https://www.birds.cornell.edu/clementschecklist/download/
- Debus, S., G. M. Kirwan, and J. S. Marks (2020). Gurney's Eagle (Aquila gurneyi), version 1.0. In Birds of the World (J. del Hoyo, A. Elliott, J. Sargatal, D. A. Christie, and E. de Juana, Editors). Cornell Lab of Ornithology, Ithaca, NY, USA. https://doi.org/10.2173/bow.gureag1.01
- Raptors of the World, James Ferguson-Lees and David Christie. ISBN 9780713669572
- Debus, S., G. M. Kirwan, and J. S. Marks (2020). Gurney's Eagle (Aquila gurneyi), version 1.0. In Birds of the World (J. del Hoyo, A. Elliott, J. Sargatal, D. A. Christie, and E. de Juana, Editors). Cornell Lab of Ornithology, Ithaca, NY, USA. https://doi.org/10.2173/bow.gureag1.01
Recommended Citation
- BirdForum Opus contributors. (2025) Gurney's Eagle. In: BirdForum, the forum for wild birds and birding. Retrieved 7 January 2025 from https://www.birdforum.net/opus/Gurney%27s_Eagle
External Links
GSearch checked for 2020 platform.1
