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Difference between revisions of "Gurney's Eagle" - BirdForum Opus

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(Added to ==Behaviour==)
(Resources link. Minor layout. References updated)
 
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[[Image:- Gurney s eagle Aquila gurneyi .jpg|thumb|550px|right|Photo by {{user|mehdhalaouate|mehdhalaouate}}<br />Waigeo island, [[Papua]], November 2014]]
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[[Image:- Gurney s eagle Aquila gurneyi .jpg|thumb|550px|right|Photo &copy; by {{user|mehdhalaouate|Mehd Halaouate}}<br />Waigeo island, [[Papua]], November 2014]]
 
;[[:Category:Aquila|Aquila]] gurneyi
 
;[[:Category:Aquila|Aquila]] gurneyi
 
==Identification==
 
==Identification==
 
66–86 cm, 26-33.9 inches. <br />Wingspan 165–185 cm.  Immature female 3060 g
 
66–86 cm, 26-33.9 inches. <br />Wingspan 165–185 cm.  Immature female 3060 g
 
====Adult====
 
====Adult====
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*Blackish-brown plumage overall
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[[Image:Gurneys_Eagle.jpg|thumb|350px|right|Bird in flight. Note secondary bulge<br />Photo &copy; 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
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*In comparison to other ''[[Aquila]]'',
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:*Paler [[Topography#Legs_and_Feet|tarsal]] feathers
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In comparison to other ''[[Aquila]]'':
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:*Slimmer legs
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:*[[Topography#Legs_and_Feet|tarsal]] feathers paler
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:*Shorter wings
+
:*legs slimmer
−
:*Longer tail
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:*wings shorter (e.g. cf [[Black Eagle]] which this species most resembles)
 +
:*[[Topography#Wings|secondaries]] bulge outwards
 +
:*flight feathers often with whitish markings
 +
:*tail long
 
====Juvenile====
 
====Juvenile====
 
*Browner above with grey brown marbling  
 
*Browner above with grey brown marbling  
 
*Underparts getting lighter with creamy abdomen and legs   
 
*Underparts getting lighter with creamy abdomen and legs   
 
*Third and fourth year plumage has less marbled upperparts, lighter brown or cream head and underparts
 
*Third and fourth year plumage has less marbled upperparts, lighter brown or cream head and underparts
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[[Image:Gurneys_Eagle.jpg|thumb|350px|right|Photo by mehd halaouate<br />Biak, [[Papua]], [[Indonesia]], October 2005]]
 
 
====Similar species====
 
====Similar species====
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*[[Wedge-tailed Eagle]] have
+
*[[Wedge-tailed Eagle]] has:
 
:*Less yellow feet
 
:*Less yellow feet
 
:*Shorter, less rounded tail
 
:*Shorter, less rounded tail
 
:*More reddish brown in colour
 
:*More reddish brown in colour
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*In [[Moluccas]] the [[Black Eagle]] is different for the following reasons;
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*In [[Moluccas]] the [[Black Eagle]] is different for the following reasons:
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:*Slighty smaller (70-80 cm)
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:*it averages slightly smaller although with extensive overlap in measurements (65-80 cm—compare with Gurney's above)
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:*Wings are narrower at the base giving a more paddle shaped appearance
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:*its wings are narrower at the base giving a more paddle-shaped appearance
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:*Variable amounts of white on the rump, around the beak, and eyes
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:*its wings have a less distinct secondary bulge
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:*A more distinct white patch at the base of the primaries
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:*the bird's primary "fingers" are more pronounced than Gurney's
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:*Male is between 2% and 11% smaller than female (wingspan 510–520 mm, 530–568 mm in female)
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:*it has variable amounts of white on the rump, around the beak, and eyes
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:*Bare parts darker yellow
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:*Black Eagles have a more distinct white patch at the base of the primaries (not always visible)
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:*Iris darker yellow, brown changeing to pale yellow in Juvenile
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:*Their bare parts are darker yellow
 +
:*Their iris is darker yellow (brown changing to pale yellow in juveniles)
 
*Juvenile [[White-bellied Sea-Eagle]] normally has a much paler rump, underwing and undertail
 
*Juvenile [[White-bellied Sea-Eagle]] normally has a much paler rump, underwing and undertail
 
==Distribution==
 
==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]].
+
[[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==
 
==Taxonomy==
 
This is a [[Dictionary_M-S#M|monotypic]] species<sup>[[#References|[1]]]</sup>.
 
This is a [[Dictionary_M-S#M|monotypic]] species<sup>[[#References|[1]]]</sup>.
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They are known to build a large stick nest high in a tree, but little other information is available.
 
They are known to build a large stick nest high in a tree, but little other information is available.
 
====Vocalisation====
 
====Vocalisation====
−
A nasally medium to high pitched, descending piping, repeated every second  
+
A nasal sound of medium to high pitch (but descending) with a piping quality, is repeated about once per second.
 
==References==
 
==References==
−
#{{Ref-Clements6thAug15}}#Handbook of the Birds of the World Alive (retrieved August 2015)
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#{{Ref-Clements6thOct23}}#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
 
#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
 
{{ref}}
 
{{ref}}
 
==External Links==
 
==External Links==
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{{GSearch|Aquila+gurneyi}}
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{{GSearch|"Aquila gurneyi" {{!}} "Gurney Eagle"}}
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*[http://www.orientalbirdimages.org/birdimages.php?action=birdspecies&Bird_ID=883&Bird_Image_ID=9285&Bird_Family_ID=96 View more images of this species on Orientalbirdimages]
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{{GS-checked}}1
 +
<br />
 +
<br />
 +
 
 
[[Category:Birds]] [[Category:Aquila]]
 
[[Category:Birds]] [[Category:Aquila]]

Latest revision as of 22:22, 23 November 2023

Photo © by Mehd Halaouate
Waigeo island, Papua, November 2014
Aquila gurneyi

Identification

66–86 cm, 26-33.9 inches.
Wingspan 165–185 cm. Immature female 3060 g

Adult

Bird in flight. Note secondary bulge
Photo © by Mehd Halaouate
Biak, Papua, Indonesia, October 2005
  • plumage overall blackish-brown
  • Cere grey brown

In comparison to other Aquila:

  • tarsal feathers paler
  • legs slimmer
  • wings shorter (e.g. cf Black Eagle which this species most resembles)
  • 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

  • Less yellow feet
  • Shorter, less rounded tail
  • More reddish brown in colour
  • it averages slightly smaller although with extensive overlap in measurements (65-80 cm—compare with Gurney's above)
  • its wings are narrower at the base giving a more paddle-shaped appearance
  • its wings have a less distinct secondary bulge
  • the bird's primary "fingers" are more pronounced than Gurney's
  • it has variable amounts of white on the rump, around the beak, and eyes
  • Black Eagles have a more distinct white patch at the base of the primaries (not always visible)
  • Their bare parts are darker yellow
  • Their iris is darker yellow (brown changing to pale yellow in juveniles)

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

  1. Clements, J. F., P. C. Rasmussen, T. S. Schulenberg, M. J. Iliff, T. A. Fredericks, J. A. Gerbracht, D. Lepage, A. Spencer, S. M. Billerman, B. L. Sullivan, and C. L. Wood. 2023. The eBird/Clements checklist of Birds of the World: v2023. Downloaded from https://www.birds.cornell.edu/clementschecklist/download/
  2. 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
  3. Raptors of the World, James Ferguson-Lees and David Christie. ISBN 9780713669572
  4. 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

External Links

GSearch checked for 2020 platform.1

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