THE WORLD BIRDS - An Online Bird Book
RAPTORS - Eagles
Raptors are birds of prey. They are carnivorous, long lived, and have low reproductive rates. They catch their prey via strong claws – three pointing forward and one pointing backward. The raptors that hunt by day are: hawks, eagle, kites, vultures, falcons. Owls hunt by night. The raptors are spread over a number of orders: Accipitriformes (hawks and allies), Cathartiformes (New World vultures), Falconiformes (falcons), Strigiformes (owls).
Unlike most other birds, or mammals for that matter, almost all female raptors are larger than their male counterpart. There is no consensus as why evolution worked this way for the raptor. The theory I like best is that the bigger female can defend the nest better, while the smaller male is more agile and can find lots of little prey to bring home to the nest. That is, when the chicks are young, they need lots of little tidbits, not one humungous carcass. A side benefit of having male and female being different in size is that they tend to go after different food sources so that way they are not competing with each other for food. But if males were the bigger ones, that diversity benefit would also be true. So perhaps the overarching reason, is the male bringing home lots of tidbits.
Raptors, especially those that stalk prey from the air, tend to have dark upperparts and lighter underparts. Looking down from above a raptor, the dark upperparts tend to blend in with the ground. While looking from below, the light underparts blend better with the sky.
Many of the raptors have their conservation status listed as something other than Least Concern; that is, there is some concern about their survival. A contributing factor is that raptors need a considerable area to offer them sufficient prey. As habitats degrade, they have less area to patrol, and less prey in the remaining areas, a double whammy. Also, for millennia, raptors have been at the top of the food chain and did not need to worry about their longterm survival. As a result, they have evolved to have few offspring, sometimes only 1. Thus if a population decreases, it is hard for it to recover.
Accipitriformes
The order Accipitriformes is made of of three families: Accipitridae, Pandionidae, and Sagittariidae. Accipitridae contains the
hawks,
eagles,
kites,
Old World vultures.
Pandionidae only contains one species - the osprey, and
Sagittariidae only contains the secretary bird.
Accipitridae
Accipitrine raptors generally have broad wings with rounded ends. As indicated below, the family is divided into 9 subfamilies. The characteristics of each of the subfamilies will be given prior to a description for each of their species. A confusing factor for presenting the subfamilies is that common terms such as eagles or kites do not correspond to a specific subfamily. For example, eagles belong to two different subfamilies and kites to 5 subfamilies!
The Accipitridae family has the following subfamiles:
Aquilinae – booted eagles
Circaetinae – serpent eagles
Harpiinae – forest eagles
Accipitrinae – accipitrine hawks
Buteoninae – buteonine hawks
Harpaginae – harpagine hawks
Melieraxinae – melieraxine hawks
Elaninae – elanine kites
Perninae – honey-buzzards
Gypaetinae – gypaetine vultures and harrier-hawks
Gypinae – Old World vultures
Eagles
Bald Eagle Image by Harald Henkel
This article contains species from the following Accipitridae subfamilies: Aquilinae – booted eagles, Circaetinae – serpent eagles, and
Harpiinae – forest eagles. All but the Bateleur and the hawk bat have "eagle" in their name. For most birds of prey, the female is larger than the male. The sea-eagles, also known as fish-eagles, are usually placed by ornithologists in one of the hawk subfamilies: Buteoninae. However, the fish-eagles are placed in this article with the eagles. Placing an iconic bird such as the bald eagle with the hawks would lead to confusion.
Aquilinae – booted eagles
All species in this subfamily have legs that are covered in feathers, which leads to their name - booted eagles. The booted eagles probably separated from other family members millions of years ago. These eagles are medium to large sized raptors.The pygmy eagle weights about 500g while the golden eagle and martial eagles both weigh about 4 kg. Many species have a significant crest. The feet and talons of booted eagle species are often particularly large and powerful relative to their size. They have very good eye-sight.
Booted eagles are found on every continent. with a disproportionate number living in Africa. The majority of the species are forest dwelling, but some prefer tundra, praires, rocky, or mountainous areas. Those that live in open areas tend to seek their prey while flying, while forest dwellers find it more profitable to search while perched in a tree. But they are flexible in their hunting approach and also flexible about what to eat: mammals, other birds, reptiles, or amphibians. There is not a vegetarian in the group as is evident when their bill or feet are examined.
Booted eagles require a large area for their hunting, a dozen square kilometers or more. They defend their territory via aerial displays or voiced threats. Their large nests are usually in trees, but also on the ground. The female incubates the eggs while the male provides her with food. They usually only have 1 to 3 eggs per brood. The hatchings are spread out and the older thus larger sibling often kills the litter mates.
Genus Aquila
This is the genus of "true" eagles. Most are predominantly dark colored, all have feathers on their legs, and their favorite food are small mammals such as rabbits. The smallest of this genus is the Cassin's hawk-eagle weighing up to 1200 gm. The largest is perhaps the wedge-tailed eagle which weighs up to 5300 gm and has been recorded with a wingspan of 284 cm (9ft 4 in).
Eagle,_African Hawk- Aquila spilogaster
Image by: 1)
Paul Seligman 2)
Ian White - South Africa 2)
Chris Eason - South Africa 4)
Steve Garvie - Kenya
Eagle,_Bonelli's Aquila fasciata
Image by: 1)
Seshardri KS - India 2)
Andy Li 3)
Imran_Shah - Pakistan
f
Eagle,_Cassin's Hawk- Aquila africana
Image by: 1)
Joseph Mochoge - Kenya
Eagle,_Golden Aquila chrysaetos
Image by: 1)
BlueRidgeKitties - North Carolina
2, 4) Dick Daniels -
Carolina
Raptor Center 3)
J. Glover of Atlanta,
Georgia 5)
Juan_lacruz - Spain 6)
Imram_Shah - Pakistan
Eagle,_Gurney's Aquila gurneyi
Image by: 1)
Joseph Wolf
Eagle,_Imperial Aquila heliaca
Image by: 1)
Sumeet_Moghe 2)
AngMoKio 3) Sergey Pisarevskiy - South Siberia, Russia 4)
Koshy_Koshy 5)
Bernd_Thaller
1) Juvenile
Eagle,_Spanish Aquila adalberti
Image by: 1)
Antonio Gomez 2)
Rodrigo_Argenton
1) Juvenile
Eagle,_Steppe Aquila nipalensis
Image by: 1)
Patricia van Casteren 2)
Sumeet_Moghe 3)
Andy Li 4)
Sergey Pisarevskiy - South Siberia, Russia
Eagle,_Tawny Aquila rapax
Image by:
1) Yathin Krishnappa 2, 5)
Arno Meintjes 3, 4) Koshy_Koshy - India
1, 2) Light morph 3 - 5) Dark morph
Eagle,_Verreaux's Aquila verreauxii
Image by:
1, 2) Dick Daniels -
Radical Raptors, South Africa
3. 4) Derek_Keats - South Africa
Eagle,_Wedge-tailed Aquila audax
Image by: 1)
David Cook - Queensland 2)
Brian_McCauley
3)
Oystercatcher - New South Wales 4)
Fir0002 - Victoria
3) Note the long tail 4) Note the long legs
Genus Clanga
Eagle,_Greater Spotted Clanga clanga
Image:
1, 2)
Koshy_Koshy - Indiadark morph 3)
Hari_Patibanda - India
1, 2) Dark morph
Eagle,_Indian Spotted Clanga hastata
Image by: 1)
Ravi Vaidyanathan 2)
Chinmayisk
Eagle,_Lesser Spotted Clanga pomarina
Image by: 1)
Steve Groom 2)
Wolbrum_avner 3)
Dominic_Sherony. 3)
Artur Mikotajewski - Poland
Genus Hieraaetus
Eagle,_Ayres's Hawk- Hieraaetus ayresii
Image by: 1) Male
Johann du Preez - ZImbabwe 2) Dark morph
Nik_Borrow - Ethiopia 3)
George_Wilson - Botswana
Eagle,_Booted Hieraaetus pennatus
Image by:1)
Subramanya_CK 2)
Lip Kee Yap 3)
Muchaxo - Portugal 4)
Imram_Shah - Pakistan
1) Dark morph 2 - 4) Pale morph
Eagle,_Little Hieraaetus morphnoides
Image by: 1) Jean_and_Fred 2)
birdsaspoetry 3)
Paul Hitch
1) Dark form 2, 3) Light form
Eagle,_Pygmy Hieraaetus weiskei
Image by: 1)
Sergey_Yeliseev 2)
David_Mitchell
Eagle,_Wahlberg's Hieraaetus wahlbergi
Image by: 1)
Doug Newman - Kruger National Park, South Africa 2)
Ian
White 3)
Darren Bellerby -
Maasai Mara, Kenya
1, 2) Intermediate morph 3) Dark morph
Genus Ictinaetus - 1 species
Eagle,_Black Ictinaetus malaiensis
Image by: 1)
Tarique Sani - India 2)
Kalyanvarma 3)
Jim_Cox - India
Genus Lophaetus - 1 species
Eagle,_Long-crested Lophaetus occipitalis
Image by:
1, 2) Dick Daniels - Kenya 3)
Derek_Keats
Genus Lophotriorchis - 1 species
Eagle,_Rufous-bellied Lophotriorchis kienerii
Image by: 1)
Magalhães 2)
Shrikant_rao
Genus Nisaetus
The
hawk-eagles are found mainly in tropical Asia. They are slender bodied, medium sized eagles with rounded wings, long feathered legs, barred wings, crests and usually adapted to forest habitats. They have large bills and feet. They are not fussy, choosing what they can find to eat among birds, mammals or reptiles.
The hawk-eagles hunt from cover inside the forest and along forest edge. These hawk-eagles are in the Aquilinae (booted eagles) subfamily and thus have feathered legs. Of this genus, the smallest species is the Wallace's hawk-eagle at 500-610 gm. Tied for the largest is Legg's hawk-eagle and the mountain hawk-eagle at 2300 - 2700 gm.
Genus
Spizaetus contains the New World hawk-eagles.
Eagle,_Blyth's Hawk- Nisaetus alboniger
Image by:
1, 3) Hiyashi Haka - Malaysia 2)
Green_Baron_Pro - Malayasia
Eagle,_Changeable Hawk- Nisaetus cirrhatus
Image by: 1)
MyLittleFinger- India 2)
James Gordon - Sri Lanka 3)
Kesara Rathnayake - Sri Lanka 4)
Gaurika Wijeratne - Sri Lanka
1, 2) Dark morph 3, 4) Light morph
Eagle,_Flores_Hawk- Nisaetus floris
Image by: 1)
Unknown 2)
Abdul_Azis_Gizan
Eagle,_Javan Hawk- Nisaetus bartelsi
Image by: 1)
Midori - Bandung Zoo 2)
Eko_Prastyo 3)
Lip Kee - Indonesia
Eagle,_Legge's_Hawk- Nisaetus kelaarti
Image by: 1)
Yathin_Krishnappa
Eagle,_Mountain Hawk- Nisaetus nipalensis
Image by: 1)
Ron Knight 2)
Shrikant Rao - Bengal 3)
Lip Kee Yap - Malaysia
Eagle,_Philippine Hawk- Nisaetus philippensis
Image by: 1)
Chris Angelo Perez 2)
David_Quitoriano
Eagle,_Pinsker's_Hawk- Nisaetus pinskeri
No images in public domain.
Eagle,_Sulawesi Hawk- Nisaetus lanceolatus
Image by:
1, 2) Lip Kee - Indonesia
1, 2) Juvenile
Eagle,_Wallace's Hawk- Nisaetus nanus
Image by: 1)
Mark Louis Benedict - Malaysia 2)
Bernard_Dupont 3)
Aqil_F
2) Sub-adult 3) Juvenile
Genus Spizaetus
New World hawk-eagles. They are forest birds with several species having a preference for highland woodlands. They build stick nests in trees. The sexes are similarly plumaged with typical raptor brown
upperparts and pale underparts, but young birds are distinguishable from adults, often by a whiter head. These hawk-eagles are in the Aquilinae (booted eagles) subfamily and thus have feathered legs.
Eagle,_Black Hawk- Spizaetus tyrannus
Image by: 1)
Tom Friedel (
BirdPhotos.com) - Argentina 2)
Nick Athanas - Columbia 3)
Dave Wendelken - Panama
Eagle,_Black-and-white Hawk- Spizaetus melanoleucus
Image by: 1)
Magalie L'Abbé 2) Mateus Hidalgo 3)
Yusoff_Ahmad
Eagle,_Black-and-chestnut Spizaetus isidori
Image by: 1) Marc Athanase Parfait 2) Tom Friedel (BirdPhotos.com) 3) Arley_Vargas
Eagle,_Ornate Hawk- Spizaetus ornatus
Image by: 1)
Mdf - Panama Juan 2)
Nathan Rupert - San Diego Zoo 3)
Mateus Hidalgo
1) Juvenile
Genus Stephanoaetus - 1 species
Eagle,_Crowned Stephanoaetus coronatus
Image by: 1) Steve Garvie - Kenya 2)
Bernard_Dupont - South Africa 3)
Derek_Keats - Soth Africa
Circaetinae – serpent eagles
The serpent eagles mainly specialize in eating snakes, lizards, and other reptiles. Some of this subfamily are just as likely to eat small mammals and birds, but they are the exception. The mostly live in temperate or tropical regions of the Old World. Serpent-eagles build stick nests and lay just one egg. They are found in Eurasia and Africa, not in the New World.
Genus Circaetus
The Snake-eagles eat mainly snakes but also lizards and small mammals. Their excellent eyesight enables them to spot their prey at a distance. They are medium sized eagles. Unlike the booted eagles, their lower legs are not feathered. They are found exclusively in Africa, except for the short-toed snake-eagle which is also found in a limited part of Europe and Asia.
Eagle,_Black-chested Snake- Circaetus pectoralis
Image by: 1)
Gaurav Pandit - Tanzania 2)
Arno Meintjes 3)
Nik_Borrow
Eagle,_Beaudouin's Snake- Circaetus beaudouini
Image by:
1, 3) Steve Garvie - Gambia 2)
David Cook - Uganda
Eagle,_Brown Snake- Circaetus cinereus
Image by: 1)
Aviceda - Murchison Falls NP, Uganda 2)
Arno Meintjes 3)
Nik_Borrow - Tanzania 4)
Bernard_Dupont. - South Africa
Eagle,_Short-toed Snake- Circaetus gallicus
Image by: 1)
Orchi 2)
Mario M 3)
JV Verde - Portugal
Eagle,_Southern Banded Snake- Circaetus fasciolatus
Image by: 1)
Peter_Steward - Malawi 2
Nick Athanas - Kenya
Eagle,_Western Banded Snake- Circaetus cinerascens
Image by: 1)
Nik_Borrow - Uganda 2)
Bernard_Dupont - Uganda 3)
Nik_Borrow - Zambia 4)
Ron Knight
Genus Dryotriorchis - 1 species
For other serpent-eagles, see
Spilornis and
Eutriorchis.
Eagle,_Congo-Serpent Dryotriorchis spectabilis Found:
Image by:
1, 2,
3) Nik_Borrow - Gabon, Ghana
1, 2) Female 3) Male
Genus Pithecophaga - 1 species
Eagle,_Philippine Pithecophaga jefferyi Found:
Image by: 1) Voltaire Malazarte 2)
Harrybalais - The Philippine Eagle Center
3)
scorpious18
Genus Spilornis
The Asian serpent-eagles have a dark crown, bright yellow eyes and cere (waxy covering at base of bill). Other speices termed serpent-eagles are
Congo Serpent-Eagle and
Madagascar Serpent-Eagle.
Eagle,_Andaman Serpent- Spilornis elgini Found: India
Image by: 1) Balaji Venkatesh Sivaramakrishnan 2)
TR_Shankar_Raman
Eagle,_Crested Serpent- Spilornis cheela
Image by: 1)
Sasidharanmanekkara 2)
J
M Garg - India 3)
Andy_Li
Eagle,_Mountain_Serpent- Spilornis kinabaluensis
No public domain images available.
Eagle,_Nicobar_Serpent- Spilornis klossi
Image by: 1)
Shreeram_MV
Eagle,_Philippine Serpent- Spilornis holospilus
Image by: 1)
Charles Laigo 2)
Lip Kee 3)
Ranieljosecastaneda 4)
Mark A Harper
Eagle, Sulawesi Serpent- Spilornis rufipectus
Image by: 1)
Joseph Wolf 2)
Peter_Wilton
Genus Terathopius - 1 species
Bateleur Terathopius ecaudatus
Image by: 1)
Nathan Rupert 2, 3, 4) Nik_Borrow 5
) Arno Meintjes 6)
Tony Hisgett
2, 3) Male 4 -6 Female
Harpiinae – forest eagles
There are only four species in this forest eagle subfamily. They are found mainly in tropical forests. They are named after the mythological greek monsters, half human and half bird, that carry people to the underworld. Their size varies greatly from the bat hawk of under 650 g. to the harpy eagle which can weigh more than 7 kg.
Genus Harpia - 1 species
Eagle,_Harpy Harpia harpyja
Image by: 1)
Alan_Hopkins 2)
Tom Friedel (
BirdPhotos.com)
3) Nick Athanas - Brazil 4)
Jitze_Couperus
1) Juvenile
Genus Harpyopsis - 1 species
Eagle,_New Guinea Harpyopsis novaeguineae
Image by: 1)
Markaharper 2)
gailhampshire
Genus Macheiramphus - 1 species
Even though this species is called the bat hawk, it is currently placed in eagle subfamily Harpiinae. It used to be classified with the small kite subfamily elanine which have long slender wings, while the bat hawk has relatively broad wings. However, the bat hawk's small size of under 650 g. also seems to be a misfit with the much larger forest eagles. It will probably be reclassified yet again.
Hawk,_Bat Macheiramphus alcinus
Image by: 1)
Johan van Rensburg 2)
Gary Albert
Genus Morphnus - 1 species
Eagle,_Crested Morphnus guianensis
Image by: 1)
Yannick_TURBE 2)
Alex_Lee 3)
jacksnipe1990
1) Dark morph
Fish Eagles and Sea-Eagles
The fish eagels have structures on its toes called spiricules that allow it to grasp fish and other slippery prey. Many of the fish eagles have almost as much feathering on their legs as do the booted eagles. The fish eagles are probably closer to kites of genus
Milvus which has been placed in the hawk subfamily Buteoninae. Instead of placing them with the hawks, they are placed here with the eagles to save confusion.
Genus Haliaeetus
Fish eagles, also know as sea eagles, eat mainly fish and small mammals. Most have white tails.
Eagle,_African Fish- Haliaeetus vocifer
Image by:
1, 4)
AngMoKio 2)
Charles_Sharp - Ethiopia
3) Dick Daniels - Tanzania
Eagle,_Bald Haliaeetus leucocephalus
Image by: 1)
Rick Leche 2)
RoNg - Oregon
3) Dick Daniels - Brookfield Gardens, South Carolina
4) Ted Grussing 5)
Andy_Morffew - Alaska
1) 2 year 2) 3 year juvenile
Eagle,_grey-headed Fish- Haliaeetus ichthyaetus
Image by: 1)
Steve Garvie - Sri Lanka 2)
Lip Kee - India 3)
Soubhagya S Behera - India
Eagle,_Lesser Fish- Haliaeetus humilis
Image by: 1)
LonelyShrimp 2)
Subramanya CK 3)
Raman_Kumar
Eagle,_Madagascar Fish- Haliaeetus vociferoides
Image by: 1)
Alan_Hopkins 2)
Francesco_Veronesi 3)
Frank Vassen
1) Juvenile
Eagle,_Pallas's Sea- Haliaeetus leucoryphus
Image by:
1, 2) Lip Kee Yap - Kazaringa, Assam, India 3)
Pankaj Kaushal - India 4)
Koshy_Koshy - India
Eagle,_Sanford's_Sea- Haliaeetus sanfordi
Image by: 1)
Katerina_Tvardikova 2) Tony_Morris
Eagle,_Steller's Sea- Haliaeetus pelagicus Found: Asia
Image by: 1)
Dmitry Valberg 2)
Jorg Hempel 3)
Dick Daniels -
National Aviary 4)
GruenesMonster72 - Japan
Eagle,_White-bellied Sea- Haliaeetus leucogaster Found:
Image by: 1)
MagicFluet1983 2)
Dick Daniels - Featherdale Wildlife Park, Australia 3)
Djambalawa - Western Australia
4, 5) birdsaspoetry
Eagle,_White-tailed Haliaeetus albicilla
Image by: 1)
Jan_Svetlik 2)
Jorg Hempel 3)
Yathin sk - Norway
4)
www.volganet.ru
1) Adult and juvenile
Genus Polemaetus - 1 species
Eagle,_Martial Polemaetus bellicosus
Image by:
1) Arno
Meintjes 2) Dick Daniels -
Radical Raptors in
South Africa 3)
Rob_Donnelly 4)
Charles_Sharp - Zimbabwe
1) Juvenile
Genus
Pandion
The osprey and owls (Strigiformes) are the only hunters whose outer toe is reversible, allowing them to grasp their prey with two toes in front and two behind. This is particularly helpful when they grasp slippery fish. Some divide the ospreys from Australasian into a separate species, the eastern osprey (
Pandion cristatus). That will not be done here.
Osprey Pandion haliaetus
Image by: 1) Dick Daniels - Florida
2, 3) Dick - North Carolina
This family has only one species.
Secretarybird Sagittarius serpentarius
Image by: 1)
Carol Foil -Rift Valley, Kenya 2)
Brian
Ralphs 3)
DIck Daniels - Tanzania
4) Dick - Nairobi National Park, Kenya
Stephen_Temple - South Africa