THE WORLD BIRDS - An Online Bird Book
RAPTORS - Old World Vultures
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
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
Old World Vultures
Order Accipitriformes Family Accipitridae
Old World vultures are not closely related to New World vultures. They resemble each other because of convergent evolution. Vultures in general feed on dead animals. They tend to have bald heads to minimize the feathers that get contaminated from carrion. They have broad wings for efficient soaring, Old World vulture do not have a good sense of smell and thus locate their meals by sight.
Many of the vulture species have a declining population. Often the major reason for the decline is eating carrion that contains the drug
diclofenac which is a steroid vets give to working animals to reduce joint pain. This drug can cause kidney failure in some vulture species. Other contributing factors to their decline are: collisions with power lines, eating lead gunshot, hunting for use in "medicine and magic", and a decline in available carcasses. In general, vultures take years to sexually mature and when they do produce young they are not prolific.
The decline of vultures populations can result in carcasses not being eaten which in turn contributes to the spread of disease.
There are two Accipitridae subfamilies for the Old World vultures: Gypaetinae and Gypinae.
Gypaetinae – gypaetine vultures and harrier-hawks
There are only 5 species in the Gypaetinae subfamily and only the bearded vulture specializes in eating carrion. The palm-nut vulture mainly eats the fruit of palm trees; the Egyptian vulture eats mammal feces, insects in dung, live mammals, carrion; and the two harrier-hawk species do not eat carrion. Because of these eating habits, some taxonomic authorities place the Gypaetinae within the Perninae hawks. All of these species are found in Africa. The bearded vulture and Egyptian vulture are also found in Europe and Asia.
Genus Gypaetus - 1 species
Vulture,_Bearded Gypaetus barbatus
Image by:
1, 2) Richard Bartz 3)
Rob 4)
Jayhem - Switzerland
Genus Gypohierax - 1 species
Vulture,_Palm-nut Gypohierax angolensis
Image by: 1)
Dick Daniels -
Jacksonville Zoo 2) Nik Borrow - Libia
3)
Sergey Yeliseev - Kenya
4) Sias van Schalkwyk - South Africa
Genus Neophron - 1 species
Vulture,_Egyptian Neophron percnopterus
Image by: 1)
Sandy Cole - San Diego Zoo 2)
Dick
Daniels - San Diego Zoo 3)
Norbert Potensky 4)
Sergey Yeliseev - Israel
Genus Polyboroides
Hawk,_African Harrier-Polyboroides typus
Image by:
1) Charlie Westerinen - Botswana 2)
Dick Daniels -
World of Birds, South Africa 3)
Charles_Sharp - Zimbabwe 4)
Andrew_Keys - South Africa
Hawk,_Madagascar Harrier- Polyboroides radiatus
Image by: 1)
Werner Witte 2)
Frank Wouters Charles_Sharp
1) Juvenile
Gypinae – Old World vultures
In general vultures are not pleasant to look at, at least from a human perspective. Their body has evolved to efficiently tear into dead bodies, even those that are rotting. A gruesome task, but a necessary one and very benificial to nature and humans specifically. Following the tenant "beauty is as beauty does" could they really be beautiful?
There are 13 species in the Gypinae subfamily. Eight of these belong the Gyps genus and are often referred to as griffon vultures. They have an unfeathered head and neck,which are usually covered with light colored fuzz. They have a light colored fluffy neck collar termed a ruff. The population of most Gyps vultures are declining.
Genus Aegypius - 1 species
Vulture,_Monk Aegypius monachus
Image by:
1, 3) Koshy_Koshy - India 2)
Joachim S. Müller 4)
Artemy_Voikhansky - Israel
1) Juvenile
Genus Gyps
The Griffon vultures all mainly eat carrion. For sanitary reasons they have evolved to have an unfeathered head and neck, usually covered with light colored fuzz. They have a light colored fluffy neck collar termed a ruff. The population of most Gyps vultures are declining. A major reason for this decline is eating carrion that contains the drug
diclofenac which is a steroid vets give to working animals to reduce joint pain. This drug can cause kidney failure in some vulture species. The decline of vultures results in carcasses not being eaten which in turn contributes to the spread of disease.
The Eurasian griffon vulture is found in Europe, Asia, and Africa. The remaining species in this genus are found in Africa and / or Asia.
Vulture,_Cape Gyps coprotheres
Image by: 1)
Ian White 2)
Heather Paul 3) Cristiano Crolle - Namibia 4)
NJR ZA
Vulture,_Eurasian Griffon Gyps fulvus
Image by: 1)
Jorg Hempel 2)
Ingrid Taylor - Oakland Zoo, California 3)
Cesare Dolzani 4) Cristiano Crolle - France
Vulture,_Himalayan
Gyps himalayensis
Image by: 1)
Koshy_Koshy - India 2)
Sahana_M - northern India 3)
Imram_Shah - Pakistan
1) Juvenile
Vulture,_Indian Gyps indicus
Image by:
1)
Shantanu_Kuveskar 2)
Shankar_Raman 3)
Sandeep Somasekharan - Ramanagaram, India
Vulture,_Rüppell's also
Rüppell's Griffon Vulture Gyps rueppelli
Image by: 1)
Carol Foil - Kenya 2) Dick Daniels - Tanzania
3, 4) Nik_Borrow - Tanzania
Vulture,_Slender-billed Gyps tenuirostris
Image by: 1)
Mike_Prince 2)
Bill_Bacon - Cambodia
Vulture,_White-backed Gyps africanus
Image by: 1)
Lip Kee - Kenya
2, 4,Dick Daniels - Keekorok Lodge in the Masai Mara, Kenya
3) Dick - Jacksonville Zoo, Florida
5) Charlie Westerinen - Zimbabwe
1) Juvenile
Vulture,_White-rumped Gyps bengalensis
Image by:
1) Goran Ekstrom 2)
Steve Babb 3)
Umang Dutt - India
Genus Necrosyrtes - 1 species
Vulture,_Hooded Necrosyrtes monachus
Image by:
1) Dick Daniels - San Diego Zoo 2)
Gabriel Buissart 3)
Darren
Bellerby - Maasai Mara, Kenya 4
) Dick - Keekorok Lodge in the Masai Mara, Kenya
Genus Sarcogyps - 1 species
Vulture,_Red-headed Sarcogyps calvus
Image by: 1)
Davidvraju - India 2)
Sumeet_Moghe - India 3)
Diyendu Ash
1) Female 2, 3) Male
Genus Torgos - 1 species
Vulture,_Lappet-faced Torgos tracheliotos
Image by: 1))
Dick - Tanzania 2)
Darren
Bellerby - Maasai Mara, Kenya 3)
Nik_Borrow - Tanzania 4)
Johann du Preez
Genus Trigonoceps - 1 species
Vulture,_White-headed Trigonoceps occipitalis
Image by: 1)
Luc Viatour 2)
Merijn Vogel 2)
Nik_Borrow - Ethiopia 3)
Ayush1025 3)
Andree Kroger 4)
David Schenfeld - Botswana