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The ACCIPITRIDAE, one of the four families within the order Accipitriformes (the others being Cathartidae , Pandionidae and Sagittariidae ), are a family of small to large birds with strongly hooked bills and variable morphology based on diet. They feed on a range of prey items from insects to medium-sized mammals , with a number feeding on carrion and a few feeding on fruit. The Accipitridae have a cosmopolitan distribution , being found on all the world's continents (except Antarctica
Antarctica
) and a number of oceanic island groups. Some species are migratory .

Many well-known birds, such as hawks , eagles , kites , harriers and Old World vultures are included in this group. The osprey is usually placed in a separate family (Pandionidae), as is the secretary bird (Sagittariidae), and the New World vultures are also usually now regarded as a separate family or order. Karyotype
Karyotype
data indicate the accipitrids analysed are indeed a distinct monophyletic group, but whether this group should be considered a family or one or several order(s) on their own is a question still to be resolved.

CONTENTS

* 1 Systematics * 2 Morphology * 3 Diet and behavior * 4 Reproductive biology and populations

* 5 Genera

* 5.1 Fossil
Fossil
record

* 6 Footnotes * 7 References * 8 External links

SYSTEMATICS

The accipitrids have been variously divided into some five to 10 subfamilies . Most share a very similar morphology , but many of these groups contain taxa that are more aberrant. These are placed in their respective position more for lack of better evidence than anything else. It is thus not very surprising that the phylogenetic layout of the accipitrids has always been a matter of dispute.

The accipitrids are recognizable by a peculiar rearrangement of their chromosomes . Apart from this, morphology and mtDNA cytochrome b sequence data give a confusing picture of these birds' interrelationships. What can be said is that the hawks , kites , eagles and Old World vultures as presently assigned in all likelihood do not form monophyletic groups:

According to the molecular data, the Buteoninae
Buteoninae
are most likely poly- or paraphyletic , with the true eagles, the sea eagles , and the buteonine hawks apparently representing distinct lineages. These appear to form a group with the Milvinae , Accipitrinae and Circinae but the exact relationships between the lineages are not at all robustly resolvable with the present data. The Perninae and possibly the Elaninae are older lineages, as are the Old World vultures. The latter are fairly likely also poly- or paraphyletic, with some aberrant species like the bearded and Egyptian vultures standing apart from the naked-necked "true" vultures.

MORPHOLOGY

Portrait of a bald eagle , showing its strongly hooked beak and the cere covering the base of the beak.

The Accipitridae
Accipitridae
are a diverse family with a great deal of variation in size and shape. They range in size from the tiny pearl kite ( Gampsonyx swainsonii) and little sparrowhawk ( Accipiter
Accipiter
minullus), both of which are 23 cm (9 in) in length and weigh about 85 g (3 oz), to the cinereous vulture ( Aegypius monachus), which measures up to 120 cm (47 in) and weighs up to 14 kg (31 lbs). Wingspan can vary from 39 cm (15 in) in the little sparrowhawk to more than 300 cm (120 in) in the cinereous and Himalayan vultures ( Gyps himalayensis). In these extreme species, wing chord length can range from 113 to 890 mm (4.4 to 35.0 in) and culmen length from 11 to 88 mm (0.43 to 3.46 in). Until the 14th century, even these huge vultures were surpassed by the extinct Haast\'s eagle (Harpagornis moorei) of New Zealand, which is estimated to have measured up to 140 cm (55 in) and to have weighed 15 to 16.5 kg (33 to 36 lb) in the largest females. In terms of body mass, the Accipitridae
Accipitridae
are the most diverse family of birds and may also be in terms of some aspects of linear size diversity, although lag behind the true parrots and pheasant family in length diversity. Most accipitrids exhibit sexual dimorphism in size, although, unusually for birds, it is the females that are larger than the males. This sexual difference in size is most pronounced in active species that hunt birds, such as the Accipiter
Accipiter
hawks, in which the size difference averages 25–50%. In a majority of species, such as generalist hunters and rodent -, reptile -, fish -, and insect -hunting specialists, the dimorphism is less, usually between a 5% to 30% size difference. In the carrion-eating Old World vultures and snail eating kites , the difference is almost non-existent.

The beaks of accipitrids are strong and hooked (sometimes very hooked, as in the hook-billed kite or snail kite ). In some species, there is a notch or 'tooth' in the upper mandible. In all accipitrids, the base of the upper mandible is covered by a fleshy membrane called the cere, which is usually yellow in colour. The tarsi of different species vary by diet; those of bird-hunting species, such as sparrowhawks, are long and thin, whilst species that hunt large mammals have much thicker, stronger tarsi, and the tarsi of the snake-eagles have thick scales to protect from bites.

The plumage of the Accipitridae
Accipitridae
can be striking, but rarely utilises bright colours; most birds use combinations of grey, buff and brown. Overall they tend to be paler below, which helps them seem less conspicuous when seen from below. There is seldom sexual dimorphism in plumage, when it occurs the males are brighter or the females resemble juveniles. In many species juveniles have a distinctly different plumage. Some accipitrids mimic the plumage patterns of other hawks and eagles. They may attempt to resemble a less dangerous species to fool prey, or instead resemble a more dangerous species in order to reduce mobbing by other birds. Several species of accipitrid have crests used in signalling, and even species without crests can raise the feathers of the crown when alarmed or excited. In contrast most of the Old World vultures possess bare heads without feathers; this is thought to prevent soiling on the feathers and aid in thermoregulation .

The senses of the Accipitridae
Accipitridae
are adapted to hunting (or scavenging), and in particular their vision is legendary. The sight of some hawks and eagles is up to 8 times better than that of humans. Large eyes with two fovea provide binocular vision and a "hawk eye" for movement and distance judging. In addition they have the largest pectens of any birds. The eyes are tube shaped and cannot move much in their sockets. In addition to excellent vision many species have excellent hearing, but unlike in owls sight is generally the principal sense used for hunting. Hearing may be used to locate prey hidden in vegetation, but sight is still used to catch the prey. Like most birds the Accipitridae
Accipitridae
generally have a poor sense of smell; even the Old World vultures make no use of the sense, in contrast to the New World vultures in the family Cathartidae .

DIET AND BEHAVIOR

Palm-nut vulture is an unusual frugivorous accipitrid, but will also consume fish, particularly dead fish Shikra Accipiter badius in Hyderabad, India Oriental honey-buzzard Pernis ptilorhyncus

Accipitrids are predominantly predators and most species actively hunt for their prey. Prey is usually captured and killed in the powerful talons of the raptor and then carried off to be torn apart with a hooked bill for eating or feeding to nestlings. A majority of accipitrids are opportunistic predators that will take any prey that they can kill. However, most have a preference for a certain type of prey, which in harriers and the numerous buteonine hawks (including more than 30 species in the Buteo genus) tends towards small mammals such as rodents .

Among the raptors that mainly favor small mammals, harriers generally hunt by hovering over openings until they detect their prey and descend upon them. Due to the specificity of their hunting style, prey preferences, and habitat preferences, usually only one harrier species tends to be found per region.

Buteonine hawks usually watch for prey from a perch but most species will also readily hunt on the wing, including from a high soar. Many buteonines are amongst the most generalized feeders, often feeding on any active small animal they find, and will generally eat whatever diurnal rodent or lagomorph is most locally common. Although, some buteonines are more specialized, such as some species in the Buteogallus
Buteogallus
genus, which have evolved to specialize in feeding on crabs . Larger Buteogallus, namely the solitary eagles , and Geranoaetus , are much larger than other buteonines and seem to have become avian apex predators of specific habitat niches, i.e. savanna , cloud forest and páramo in South America
South America
and are thus honorary "eagles".

In Accipiter
Accipiter
hawks (the most species-rich accipitrid genus with nearly 50 extant species), prey is mainly other birds . Accipiters are in general forest- and thicket-dwelling species. Accipiter
Accipiter
hawks usually ambush birds in dense vegetation, a dangerous hunting method that requires great agility. Many smaller tropical species of Accipiter
Accipiter
eat nearly equal portions of insects and reptiles and amphibians as they do of birds while some of the larger species have become more generalized, and may feed extensively on rodents and lagomorphs as well as other various non-avian animals.

Most accipitrids will supplement their diet with non-putrid carrion but, of course, none specialized with this as well as the 14-16 species of vultures , which have evolved very large bodies (which leave them equipped to fill their crop with carrion), weaker, less specialized feet relative to other accipitrids, large wingspans to spend extensively periods of time in flight over openings scanning for carcasses and complex social behavior in order to establish a mixed species hierarchy at carrion. The New World vultures have attained several similar characteristics, but only through convergent evolution and are seemingly not directly related to Old World vultures and other accipitrids. The lammergeier ( Gypaetus
Gypaetus
barbatus) is an aberrant cousin of the Old World vultures that has maintained strong feet in order to carry and drop large bones in order to crack them open to feed on bone marrow, their primary food, a technique they also sometimes use for live prey items, like tortoises .

A few species may opportunistically feed on fruit. In one species, the palm-nut vulture ( Gypohierax angolensis) (possibly not closely related to other "vultures"), it may form more than half of the diet. Most accipitrids will not eat plant material.

Insects are taken exclusively by around 12 species, in great numbers by 44 additional species, and opportunistically by a great many others. The diet of the honey-buzzards includes not only the adults and young of social insects such as wasps and bees, but the honey and combs from their nests.

The snail kite ( Rostrhamus sociabilis), slender-billed kite ( Helicolestes hamatus) and hook-billed kites ( Chondrohierax uncinatus) are specialists in consuming snails , which usually constitute 50-95% of their diet. Other "kites " are divided into two groups, a loose assemblance of smallish raptors, many of which are strong fliers. One, exclusively in the Old World, milvine or "large" kites, are relatively large, often quite common, very generalized and often weakly predaceous feeders whereas the other kites, also known as elanine or "small" kites and mostly found in the New World, are supremely aerial, active hunters that generally alternate their primary food between insects and small mammals. One species allied with the latter kite group, the bat hawk (Macheiramphus alcinus), has come to specialize in hunting bats .

"Eagles " are several raptors that are not necessarily closely related, but can be broadly defined by large body size (larger than other raptors excluding vultures) and the taking of typically larger prey, including mid-sized mammals and larger birds. The most diverse group of eagles is the "booted eagles", a variable group of c. 30 species, defined by their feathering covering their legs (shared by only a couple of buteonine species).

Most accipitrids usually hunt prey rather smaller than themselves. However, many accipitrids of almost all sizes have been recorded as capturing and then flying with prey of equal weight or even slightly heavier than themselves in their talons, a feat that requires great physical strength. Occasionally, an eagle or other raptor that kills prey considerably heavier than itself (too heavy for the raptor to carry and fly with) will then have to leave prey where they've killed and later return repeatedly to feed or dismember and bring to a perch or nest piece by piece. This has the advantage of providing a surplus of food but has the disadvantage of potentially attracting scavengers or other predators which can steal the kill or even attack the feeding accipitrid. Using this method, accipitrids such as the golden (Aquila chrysaetos), wedge-tailed (Aquila rapax), martial (Polemaetus bellicosus) and crowned eagles ( Stephanoaetus coronatus) have successfully hunted ungulates , such as deer and antelope , and other large mammals (kangaroos and emus in the wedge-tailed) weighing more than 30 kg (66 lb), 7–8 times their own mass. More typical prey for these powerful booted eagle species weigh between 0.5 and 5 kg (1.1 and 11.0 lb).

The Haliaeetus
Haliaeetus
eagles, the Ichthyophaga eagles and the osprey (Pandion haliaetus), possibly in its own monotypical family, mainly prefer to prey on fish (comprising more than 90% of food for the latter 2 genera). These large acciptrids may supplement their diets with aquatic animals other than fish, especially the more generalized Haliaeetus
Haliaeetus
eagles, which also hunt large numbers of water birds and are expert kleptoparasites .

Reptiles and amphibians are hunted by almost all variety of acciptrids when the opportunity arises and may be favored over other prey by some eagles, i.e. Spizaetus
Spizaetus
hawk-eagles and the "eagles" in Buteogallus
Buteogallus
, and several species of buteonine hawks found in the tropics. Bazas and forest hawks in the genus Accipiter
Accipiter
may take reptiles from trees whilst other species may hunt them on the ground. Snakes are the primary prey of the snake-eagles ( Circaetus
Circaetus
) and serpent-eagles ( Spilornis
Spilornis
and Dryotriorchis ). Apparently, the mammal-hunting, huge and endangered Philippine eagle
Philippine eagle
(Pithecophaga jefferyi) is most closely related to the snake eagles. Another handsome aberration of the snake-eagle lineage (although, unlike the Philippine, has long been known to be a snake-eagle) is the bateleur ( Terathopius
Terathopius
ecaudatus), which has evolved unusually bright plumage in adults, with a huge red cere, red feet, bright yellow bill, and boldly contrasting grey-and-white markings over black plumage. The bateleur has specialized to feed extensively on carrion and almost any other feeding opportunity that presents itself.

REPRODUCTIVE BIOLOGY AND POPULATIONS

In terms of their reproductive biology and socio-sexual behavior, accipitrids share many characteristics with other extant groups of birds that appear not be directly related, but all of which have evolved to become active predators of other warm-blooded creatures. Some of the characteristics shared with these other groups, including falcons , owls , skuas and shrikes , are that the female is typically larger than the male, extreme devotion for breeding pairs to each other and often to a dedicated nesting site, strict and often ferocious territorial behavior, and, on hatching, occasional competition amongst nestlings, including regular siblicide in several species.

Before the onset of the nesting season, adult accipitrids often devote a majority of their time to excluding other members of their own species and even of other species from their nesting territories. In several species, this occurs by territorial display flights over the border of their breeding ranges. In several forest dwelling varieties, however, vocalizations are used to establish territories. Due to the density of the habitat, display flights are apparently impractical.

While a single devoted breeding pair is considered typical, research has revealed that in varied accipitrids, multiple birds engaging in nesting behavior is more commonly than previously thought. Some harriers have evolved to become polgynous, with a single smaller male breeding with and then helping multiple females raise young. The most extreme known species of accipitrid in terms of sociality is the Harris\'s hawks ( Parabuteo unicinctus), which up to seven fully-grown birds may hunt, nest and brood cooperatively, with the additional birds typically being prior years' offspring of the two most mature hawks.

Unlike the other two larger groups of raptorial birds, the owls and most falcons, accipitrids typically build their own nest. Nest sites are typically in relatively secure places, such as the crook of a large tree or an ample cliff ledge, and can vary in elevation from the flat ground of prairies or steppe to near the peaks of the tallest mountains such as the Himalayas
Himalayas
. Accipitrids will readily return to use a nest site repeatedly, which has resulted in several of the largest bird's nests known, as a single nest may see decades of use, with more material added each breeding season. The single largest known tree nest known for any animal, belong to a bald eagle ( Haliaeetus
Haliaeetus
leucocephalus), was found to be 6.1 m (20 ft) deep, 2.9 meters (9.5 ft) across, and to weigh 3 short tons (2.7 metric tons). Some species, especially eagles, will build multiple nests for use in alternating years. Although they usually use nests they build themselves, accipitrids sometimes use abandoned nests build by other animals or pirate nests from other birds, typically other types of accipitrid.

Compared to most other types of birds, the stretch from egg-laying to independence in young birds is very prolonged. In accipitrids, the breeding season ranges from about two to three months to roughly a year and a half, the latter in some of the larger tropical eagles. Species
Species
inhabiting temperate ranges as a rule have shorter breeding seasons due to the shorter stretches of warm weather that facilitates ready capture of prey.

Usually from 2 to 6 eggs are laid in accipitrids, a relatively small clutch, and some species may lay only one egg. In almost all accipitrids, eggs are laid at intervals rather than all at once and in some larger species the intervals can be several days. This results in one of the hatchlings being larger and more advanced in development than its siblings. The benefits of siblicide, which is at least occasionally recorded in many species and almost always occurs in some, such as tropical members of the booted eagle group, is that the smaller siblings are a kind of insurance policy that if the oldest, strongest nestling dies, one of the smaller siblings may take its place. In most species that have displayed siblicide, times of food plenty may result in two or more the nestlings being successfully raised to fledging.

In most accipitrids, the smaller males typically attain food both for the incubating and brooding female and the nestlings. Males, however, occasionally take a shift incubating or even more sporadically of brooding of the nestlings, which allows the female to hunt. Most accipitrids feed their nestlings by feeding them strips of meat or whole prey items, but most vultures feed their nestlings via regurgitation.

Fledgling often takes considerable effort for young birds and may take several weeks as opposed to days in many other types of birds. Once independent of their parents, young accipitrids often most wander for considerable stretches of time, ranging from 1 to 5 years before they attain maturity. Most accipitrids have distinct plumages in their immature stage, which presumably serves as a visual cue to others of their species and may allow them to avoid territorial fights. Shortly after attaining mature plumages, pairs form with a male typically displaying, often in flight but sometimes vocally, to win over a female. Many accipitrids breed with the same mate for several years or for life, although this is not the case for all species and, if a mate dies, the widowed bird will typically try to find another mate the following breeding season.

GENERA

* SUBFAMILY ELANINAE – elanine kites (6 species)

* Genus
Genus
Elanus * Genus
Genus
Chelictinia * Genus
Genus
Gampsonyx * Genus
Genus
Macheiramphus (was doubtfully placed, moved from Perninae )

* SUBFAMILY PERNINAE – honey buzzards (c.15 species)

* Genus
Genus
Aviceda * Genus
Genus
Henicopernis * Genus
Genus
Pernis * Genus
Genus
Leptodon * Genus
Genus
Chondrohierax * Genus
Genus
Elanoides

* SUBFAMILY AEGYPIINAE – Old World vultures

* Genus
Genus
Sarcogyps * Genus
Genus
Aegypius * Genus
Genus
Torgos * Genus
Genus
Trigonoceps * Genus
Genus
Gyps * Genus
Genus
Necrosyrtes

* SUBFAMILY GYPAETINAE

* Genus
Genus
Neophron * Genus
Genus
Gypohierax * Genus
Genus
Gypaetus
Gypaetus
* Genus
Genus
Eutriorchis

* SUBFAMILY BUTEONINAE – buteonine hawks, true eagles and sea-eagles (c.100 living species, probably poly- or paraphyletic )

* Genus
Genus
Geranoaetus * Genus
Genus
Buteo (probably paraphyletic , might include Leucopternis in part and Parabuteo) * Genus
Genus
Parabuteo * Genus
Genus
Rupornis – roadside hawk * Genus
Genus
Pseudastur * Genus
Genus
Morphnarchus – barred hawk * Genus
Genus
Buteogallus
Buteogallus
(probably paraphyletic , might include Leucopternis in par * Genus
Genus
Bermuteo ( Extinct
Extinct
) * Genus
Genus
Busarellus * Genus
Genus
Leucopternis (probably polyphyletic ) * Genus
Genus
Cryptoleucopteryx – plumbeous hawk * Genus
Genus
Kaupifalco * Genus
Genus
Butastur * Genus
Genus
Harpyhaliaetus * Genus
Genus
Geranospiza

* SUBFAMILY AQUILINAE

* Genus
Genus
Spizaetus
Spizaetus
* Genus
Genus
Nisaetus * Genus
Genus
Lophaetus (possibly junior synonym of Ictinaetus) * Genus
Genus
Stephanoaetus * Genus
Genus
Polemaetus * Genus
Genus
Hieraaetus * Genus
Genus
Lophotriorchis * Genus
Genus
Aquila * Genus
Genus
Clanga * Genus
Genus
Ictinaetus

* SUBFAMILY CIRCINAE – harriers (some 16 living species)

* Genus
Genus
Circus

* SUBFAMILY POLYBOROIDINAE – harrier hawks

* Genus
Genus
Polyboroides

* SUBFAMILY MILVINAE – milvine kites (some 14 species)

* Genus
Genus
Harpagus * Genus
Genus
Ictinia * Genus
Genus
Rostrhamus * Genus
Genus
Helicolestes – formerly included in Rostrhamus * Genus
Genus
Haliastur * Genus
Genus
Milvus * Genus
Genus
Lophoictinia * Genus
Genus
Hamirostra

* SUBFAMILY ACCIPITRINAE – goshawks, sparrowhawks, and relatives (c.55 living species)

* Genus
Genus
Accipiter
Accipiter
* Genus
Genus
Urotriorchis * Genus
Genus
Erythrotriorchis * Genus
Genus
Megatriorchis

* SUBFAMILY CIRCAETINAE – snake eagles (about one dozen species)

* Genus
Genus
Terathopius
Terathopius
* Genus
Genus
Circaetus
Circaetus
* Genus
Genus
Spilornis
Spilornis
* Genus
Genus
Pithecophaga

* SUBFAMILY HALIAEETINAE – sea eagles

* Genus
Genus
Haliaeetus
Haliaeetus

* SUBFAMILY HARPIINAE

* Genus
Genus
Morphnus * Genus
Genus
Harpia * Genus
Genus
Harpyopsis

* SUBFAMILY MELIERAXINAE – chanting goshawks

* Genus
Genus
Melierax ( Micronisus )

FOSSIL RECORD

Neophrontops americanus fossil Neogyps errans fossil

As with most other birds of prey, the fossil record of this group is fairly decent from the latter Eocene
Eocene
onwards (c.35 mya ), with modern genera being well documented since the Early Oligocene , or around 30 mya.

* Milvoides (Late Eocene
Eocene
of England) * Aquilavus (Late Eocene/ Early Oligocene – Early Miocene of France) * Palaeocircus (Late Eocene/ Early Oligocene of France) * Palaeastur (Agate Fossil
Fossil
Beds Early Miocene of Sioux County, USA) * Pengana (Early Miocene of Riversleigh, Australia) * Promilio (Agate Fossil
Fossil
Beds Early Miocene of Sioux County, USA) * Proictinia (Early – Late Miocene/Early Pliocene of C and SE USA) * Neophrontops (Early/middle Miocene – Late Pleistocene) – formerly in Neophron * Mioaegypius (Xiacaowan middle Miocene of Sihong, China) * Apatosagittarius (Late Miocene of Nebraska, USA) * Gansugyps (Liushu Late Miocene of China) * Palaeoborus (Miocene) * Qiluornis (Miocene of Shandong, China) * Thegornis (Miocene of Argentina) * Garganoaetus (Early Pliocene of Gargano Peninsula, Italy) * Amplibuteo (Late Pliocene of Peru – Late Pleistocene of S North America and Cuba) – may belong to extant genus Harpyhaliaetus * Neogyps * Palaeohierax – includes "Aquila" gervaisii

Accipitrids are known since Early Eocene
Eocene
times, or about from 50 mya onwards, in fact, but these early remains are too fragmentary and/or basal to properly assign a place in the phylogeny . Likewise, as remarked above, molecular methods are of limited value in determining evolutionary relationships of and within the accipitrids. What can be determined is that in all probability, the group originated on either side of the Atlantic
Atlantic
, which during that time was only 60–80% its present width. On the other hand, as evidenced by fossils like Pengana , some 25 mya, accipitrids in all likelihood rapidly acquired a global distribution – initially probably even extending to Antarctica
Antarctica
.

* Accipitridae
Accipitridae
gen. et sp. indet. (Huerfano Early Eocene
Eocene
of Huerfano County, USA) * Accipitridae
Accipitridae
gen. et sp. indet. (Borgloon Early Oligocene of Hoogbutsel, Belgium) * Accipitridae
Accipitridae
gen. et sp. indet. (Bathans Early/Middle Miocene of Otago, New Zealand) * Accipitridae
Accipitridae
gen. et sp. indet. MPEF-PV-2523 (Puerto Madryn Late Miocene of Estancia La Pastosa, Argentina) * "Aquila" danana (Snake Creek Late Miocene/Early Pliocene of Loup Fork, USA) – formerly also Geranoaetus or Buteo * Accipitridae
Accipitridae
gen. et sp. indet. (Early/Middle Pliocene of Kern County, USA) – Parabuteo? * Accipitridae
Accipitridae
gen. et sp. indet. (Late Pliocene/Early Pleistocene of Ibiza, Mediterranean) – Buteo? * Accipitridae
Accipitridae
gen. et sp. indet. (Egypt)

Specimen AMNH FR 2941, a left coracoid from the Late Eocene
Eocene
Irdin Manha Formation of Chimney Butte ( Inner Mongolia
Inner Mongolia
) was initially assessed as a basal mid-sized "buteonine"; it is today considered to be more likely to belong in the Gruiformes genus Eogrus . The Early Oligocene genus Cruschedula was formerly thought to belong to Spheniscidae , however reexamination of the holotype in 1943 resulted in the genus being placed in Accipitridae. Further examination in 1980 resulted in placement as Aves incertae sedis.

FOOTNOTES

* ^ "Catalogue of Life". Retrieved 2016-06-19. * ^ de Boer 1975 . * ^ Amaral Karl, E.; Volobouev, V.; Griffin, D.K.; Schartl, M.; Schmid, M. (2006). "Extensive gross genomic rearrangements between chicken and Old World vultures (Falconiformes: Accipitridae)". Cytogenetic and Genome Research . 112 (3–4): 286–295. doi :10.1159/000089883 . Retrieved 30 September 2011. "The karyotypes of most birds consist of a small number of macrochromosomes and numerous microchromosomes. Intriguingly, most accipitrids which include hawks, eagles, kites, and Old World vultures (Falconiformes) show a sharp contrast to this basic avian karyotype. They exhibit strikingly few microchromosomes and appear to have been drastically restructured during evolution." * ^ Wink, Heidrich & Fentzloff 1996 . * ^ Brathwaite 1992 . * ^ Worthy, T. & Holdaway, R., The Lost World of the Moa: Prehistoric Life of New Zealand. Indiana University Press (2003), ISBN 978-0253340344 * ^ A B C D E F Ferguson-Lees & Christie 2001 . * ^ Paton, Messina & Griffin 1994 . * ^ A B C Thiollay 1994 . * ^ Negro 2008 . * ^ Ward et al. 2008 . * ^ Hamerstrom, F. (1986). "Harrier, hawk of the marshes: The hawk that is ruled by a mouse." Smithsonian Institution Press"" Washington, DC, USA. * ^ Amadon, D. (1949). "Notes on Harpyhaliaetus." The Auk 53-56. * ^ Lerner, H. R., & Mindell, D. P. (2005). " Phylogeny
Phylogeny
of eagles, Old World vultures, and other Accipitridae
Accipitridae
based on nuclear and mitochondrial DNA." Molecular Phylogenetics and Evolution
Evolution
37(2), 327-346. * ^ Although not the entire diet. Thomson & Moreau 1957 . * ^ Shiu et al. 2006 . * ^ Mikula, P., Morelli, F., Lučan, R. K., Jones, D. N., & Tryjanowski, P. (2016). "Bats as prey of diurnal birds: a global perspective." Mammal
Mammal
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